If a vessel contains 56 lit of a mixture of milk and water in ratio3:2.what amount of the water should be added to make the ratio 4:5 ?

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There are 7 letters A,B,C,D,E,F,G All are assigned some numbers from 1,2 to 7. B is in the middle if arranged as per the numbers. A is greater than G same as F is less than C. G comes earlier than E. 1) Which is the fourth letter ? ( B / D / F/ E) 2) what is the difference between A and F? ( 3 /4/ 5/ 6) 3 Choose 4 consecutive letters? ( ABCD / BDFE / AEFB / NONE OF THESE )

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In a Bus there are 7 people. Each one carry 7 bags. Each bag contains 7 cat. Each cat carry 7 small cats. How many legs are there in the bus?

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There are 12 balls looks identically equal. But one of them has weight different (more or less) from other. How to find that dissimilar ball with minimum balances?

http://www.coolinterview.com/interview/13952At 6’o a clock ticks 6 times. The time between first and last ticks is 30 seconds. How long does it tick at 12’o clock? 2.A hotel has 10 storey. Which floor is above the floor below the floor, below the floor above the floor, below the floor above the fifth. 3. Two trains starting at same time, one from Bangalore to Mysore and other in opposite direction arrive at their destination 1 hr and 4 hours respectively after passing each other. How much faster is one train from other? A man collects cigarette stubs and makes one full cigarette with every 8 stubs. If he gets 64 stubs how many full cigarettes can he smoke? 5. There is one room with 3-bulbs inside and corresponding switches are outside the room. You make any combination of three switches and enter room only once. How do you find out the respective switches for these three bulbs.

http://www.coolinterview.com/interview/12726

Let D be the set of all points in the real plane such that |x| + |y| <= 1, where |x| (respectively |y|) denotes the absolute value of x (respectively y). Prove that amongst every 5 points in D, there exist two points whose distance from one another is at most 1.

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While traveling in a road, the road diverges left and right. One way goes to the heaven and other one goes to hell I want to go to heaven. In that village only two inhabitants are living one is knight and other one is knave. Knight will always speak truth and knave will always speak lie. In that road one inhabitant is standing but we don't know who is he. He might be an knight or knave i want to ask a question to that inhabitant to go to heaven. How can i identify that inhabitant is knight or knave?

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There are 4 cars . They all are coming from different directions. They have to cross through one square. They all arrive at the same time. Nobody stops . still there is no clash . note : They all are driving at a speed if 100 km/hr. options are: 1) all cars take left 2) all cars turn right 3) two cars turn left and two turn right. tell me the answer with reason.

http://www.coolinterview.com/interview/12535

Some gatekeepers are warriors and some warriors are cowards therefore some gatekeepers must be cowards. What is correct answer?

http://www.coolinterview.com/interview/12533

361 -> 22 121 -> 14 81 -> 12 25 -> X What is the value of X?

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A cube of side 4cm is painted with colors red, blue, green in such a way that opposite sides are painted in the same colour . this cube is now cut into 64 cubes of equal size .then 1) how many have atleast two sides painted in different colours. 2) how many cubes have only one side painted. 3) how many cubes have no side painted 4) how many have exactly one side not painted.

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These words follow a logical progression: CODIFY LAMINA STOVE RESET JOKUL QUIRES Which one of these comes next? REST, GRAIL, STOIC, ORDEAL

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A BUS RUN AT 100KM/HR TOP SPEED. IT CAN CARRY A MAXIMUM OF 6 PERSONS. IF SPEED OF BUS DECREASES IN FIXED PROPORTION WITH INCREASE IN NUMBER OF PERSON .FIND SPEED WHEN THREE PERSON ARE TRAVELING IN BUS?

http://www.coolinterview.com/interview/11223

If 12 distinct points are placed on the circumference of a circle and all the chords connecting these points are drawn. What is the largest number of points of intersection for these chords?

http://www.coolinterview.com/interview/11643

Let D be the set of all points in the real plane such that |x| + |y| <= 1, where |x| (respectively |y|) denotes the absolute value of x (respectively y). Prove that amongst every 5 points in D, there exist two points whose distance from one another is at most 1.

http://www.coolinterview.com/interview/11642

General Gasslefield, accused of high treason, is sentenced to death by the court-martial. He is allowed to make a final statement, after which he will be shot if the statement is false or will be hung if the statement is true. Gasslefield makes his final statement and is released. What could he have said?

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The numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9 must be put in the depicted triangle, in such a way that the sums of the numbers on each side are equal. How should the numbers be arranged in the triangle?

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In front of you are 10 bags, filled with marbles. The number of marbles in each bag differs, but all bags contain ten marbles or more. Nine of the ten bags only contain marbles of 10 grams each. One bag only contains marbles of 9 grams. In addition, you have a balance which can weigh in grams accurate, and you are allowed to use it only once (i.e. weigh a single time). How can you find out in one weighing, which bag contains the marbles of 9 grams?

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A man has a wolf, a goat, and a cabbage. He must cross a river with the two animals and the cabbage. There is a small rowing-boat, in which he can take only one thing with him at a time. If, however, the wolf and the goat are left alone, the wolf will eat the goat. If the goat and the cabbage are left alone, the goat will eat the cabbage. How can the man get across the river with the two animals and the cabbage?

http://www.coolinterview.com/interview/4509

In the middle of a round pool lies a beautiful water-lily. The water-lily doubles in size every day. After exactly 20 days the complete pool will be covered by the lily. After how many days will half of the pool be covered by the water-lily?

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**You are standing next to a well, and you have two jugs. One jug has a content of 3 liters and the other one has a content of 5 liters. How can you get just 4 liters of water using only these two jugs? **http://www.coolinterview.com/interview/4512

**Yesterday evening, Helen and her husband invited their neighbors (two couples) for a dinner at home. The six of them sat at a round table. Helen tells you the following: "Victor sat on the left of the woman who sat on the left of the man who sat on the left of Anna. Esther sat on the left of the man who sat on the left of the woman who sat on the left of the man who sat on the left of the woman who sat on the left of my husband. Jim sat on the left of the woman who sat on the left of Roger. I did not sit beside my husband." What is the name of Helen's husband? **http://www.coolinterview.com/interview/4513

**Jack and his wife went to a party where four other married couples were present. Every person shook hands with everyone he or she was not acquainted with. When the handshaking was over, Jack asked everyone, including his own wife, how many hands they shook. To his surprise, Jack got nine different answers. How many hands did Jack's wife shake? **http://www.coolinterview.com/interview/4514

**A light bulb is hanging in a room. Outside of the room there are three switches, of which only one is connected to the lamp. In the starting situation, all switches are 'off' and the bulb is not lit. If it is allowed to check in the room only once to see if the bulb is lit or not (this is not visible from the outside), how can you determine with which of the three switches the light bulb can be switched on? **http://www.coolinterview.com/interview/4515

**Tom has three boxes with fruits in his barn: one box with apples, one box with pears, and one box with both apples and pears. The boxes have labels that describe the contents, but none of these labels is on the right box. How can Tom, by taking only one piece of fruit from one box, determine what each of the boxes contains? **http://www.coolinterview.com/interview/4516

**Assume that you have a number of long fuses, of which you only know that they burn for exactly one hour after you lighted them at one end. However, you don't know whether they burn with constant speed, so the first half of the fuse can be burnt in only ten minutes while the rest takes the other fifty minutes to burn completely. Also assume that you have a lighter. How can you measure exactly three quarters of an hour with these fuses? Hint: 2fuses are sufficient to measure three quarter of an hour Hint: A fuse can be lighted from both ends at the same time (which reduces its burning time significantly)**http://www.coolinterview.com/interview/4517

**Richard is a strange liar. He lies on six days of the week, but on the seventh day he always tells the truth. He made the following statements on three successive days: Day 1: "I lie on Monday and Tuesday." Day 2: "Today, it's Thursday, Saturday, or Sunday." Day 3: "I lie on Wednesday and Friday." On which day does Richard tell the truth? **http://www.coolinterview.com/interview/4518

**Barbara has boxes in three sizes: large, standard, and small. She puts 11 large boxes on a table. She leaves some of these boxes empty, and in all the other boxes she puts 8 standard boxes. She leaves some of these standard boxes empty, and in all the other standard boxes she puts 8 (empty) small boxes. Now, 102 of all the boxes on the table are empty. How many boxes has Barbara used in total?**http://www.coolinterview.com/interview/4520

**There is a unique number of which the square and the cube together use all ciphers from 0 up to 9 exactly once. Which number is this? **http://www.coolinterview.com/interview/4522

**On a nice summer day two tourists visit the Dutch city of **http://www.coolinterview.com/interview/4523

**A swimmer jumps from a bridge over a canal and swims 1 kilometer stream up. After that first kilometer, he passes a floating cork. He continues swimming for half an hour and then turns around and swims back to the bridge. The swimmer and the cork arrive at the bridge at the same time. The swimmer has been swimming with constant speed. How fast does the water in the canal flow? **http://www.coolinterview.com/interview/4525

**William lives in a street with house-numbers 8 up to and including 100. Lisa wants to know at which number William lives. She asks him: "Is your number larger than 50?" William answers, but lies. Upon this Lisa asks: "Is your number a multiple of 4?" William answers, but lies again. Then Lisa asks: "Is your number a square?" William answers truthfully. Upon this Lisa says: "I know your number if you tell me whether the first digit is a 3." William answers, but now we don't know whether he lies or speaks the truth. Thereupon Lisa says at which number she thinks William lives, but (of course) she is wrong. What is Williams real house-number? **http://www.coolinterview.com/interview/4526