Brain Teasers & Puzzles

You can place weights on both side of weighing balance and you need to measure all weights between 1 and 1000. For example if you have weights 1 and 3,now you can measure 1,3 and 4 like earlier case, and also you can measure 2,by placing 3 on one side and 1 on the side which contain the substance to be weighed. So question again is how many minimum weights and of what denominations you need to measure all weights from 1kg to 1000kg.
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Outside a room there are three light switches. One of switch is connected to a light bulb inside the room.
Each of the three switches can be either ‘ON’ or ‘OFF’.You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)
Your task is to then determine which switch controls the bulb ??
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On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kitten, cats, sacks, wives. How many were going to St. Ives?
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Two old friends, Jack and Bill, meet after a long time.
Jack: Hey, how are you man?
Bill: Not bad, got married and I have three kids now.
Jack: That’s awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool… But I still don’t know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh now I get it.How old are Bill’s kids?
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Two identical trains, at the equator start travelling round the world in opposite directions. They start together, run at the same speed and are on different tracks.
Which train will wear out its wheel treads first?View SolutionSubmit Solution 4825 views
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A family I know has several children. Each boy in this family has as many suters as brothers but each of the girls has twice as many brothers as sisters. How many brothers and sisters are there?
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Fifty minutes ago if it was four times as many minutes past three o’clock, how many minutes is it until six o’clock?
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Next door to me live four brothers of different heights. Their average height is 74 inches, and the difference in heipht among the first three men is two inches/’The difference between the third and the fourth man is six inches.
Can you tell how tall is each brother?View SolutionSubmit Solution 2416 views
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Mr John have 25 horses, and he want to pick the fastest 3 horses out of those 25. He has only 5 track that means only 5 horse can run at a time,even he don’t have a stop watch . What is the minimum number of races required to find the 3 fastest horses?
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