Brain Teasers

Added 3 years ago

You have a jug that holds five gallons, and a jug that holds three gallons. You have no other containers, and there are no markings on the jugs. You need to obtain exactly seven gallons of water from a faucet. How can you do it?

Second Problem: You need exactly four gallons. How do you do it?

Ans. Fill 3 gallon jug , pour in 5 gallon jug, fill 3 gallon, pour 2 gallon in 5 gallon, you have 1 gallon left in the 3 gallon jug. Empty the 5 gallon. Pour the 1 gal into the 5 gallon, fill the 3 gallon and pour it in the 5 gallon (at this step you have 4 gallon). Fill the 3 gallon jug one last time and you now have 7 gallons.

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Added 3 years ago

A farmer is taking a fox, a chicken, and a bag of grain home. To get there, he must cross a river, but he's only allowed to take one item across the bridge with them at a time. If the fox is left alone with the chicken, the fox will eat the chicken. If the chicken is left alone with the grain, the chicken will eat the grain. How can the farmer cross the river without any of his possessions being eaten?

Ans. He'll carry chicken to other side. Then back and he'll carry the grain. On other bank he'll put the grain and take the chicken back. And on dis side , he'll put the chicken and he'll carry the fox, and return. And finaly he'll carry the chicken frm dis end.

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Added 3 years ago

I want you think about yourself in a squared room. There are no windows or doors. No exits at all. You can't break down the walls. It is empty with only you in it. How do you get out?

Ans. "Stop thinking" :P

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Added 3 years ago

A man who lives on the tenth floor takes the elevator down to the first floor every morning and goes to work. In the evening, when he comes back; on a rainy day, or if there are other people in the elevator, he goes to his floor directly. Otherwise, he goes to the seventh floor and walks up three flights of stairs to his apartment.
Can you explain why?

Ans. The man is of short stature. He can't reach the upper elevator buttons, but he can ask people to push them for him. He can also push them with his umbrella.

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Added 3 years ago

A Petri dish hosts a healthy colony of bacteria. Once a minute every bacterium divides into two. The colony was founded by a single cell at noon. At exactly 12:43 (43 minutes later) the Petri dish was half full.

At what time will the dish be full?

Ans. The dish will be full at 12:44.

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Added 3 years ago

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

Ans. He was born on December 31st and spoke about it on January 1st. [The day before yesterday (December 30) he was 25. He turned 26 on December 31. He talked about it on January 1. That year he would turn 27, so "next year" he would turn 28.]

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Added 3 years ago

Three brothers share a family sport:
A non-stop marathon
The oldest one is fat and short
And trudges slowly on
The middle brother's tall and slim
And keeps a steady pace
The youngest runs just like the wind,
Speeding through the race
He's young in years, we let him run,
The other brothers say
Though he's surely number one,
He's second, in a way.

Who r d three brothers??

Ans. The hands on a clock (hour, minute, and second)!!!

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