Brain Teasers

Added 3 years ago

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

Number : 236
Sum : 11

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Added 3 years ago

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 ??

turn on 1st switcch for few min. and then turn off.... turn on second switch ..enter the room ..if bulb is on then obviuosly second switch....if not then touch it through hand if the bulb is heated the switch is 1st one, o/w third switch is for bulb

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Added 3 years ago

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.

For this answer is 3^0, 3^1, 3^2... That is 1,3,9,27,81,243 and 729

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Added 3 years ago

Solve this....


Ans: 45 45 85 and 55 66 116
Sol: a*b a*c a*b+a*c-b

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Added 3 years ago


1 aadmi ko 50 kilo aata piswaany jana hy,batao kis par jae ga?
1- Motor cycle par
2- Cycle par
3- Pedal

Aata tou pisa huva hi hota hai.

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Added 3 years ago

Jack gave John the following challenge: "If you sit down in that chair, I bet I can make you get out of it before I run around the chair three times," he said.

"Aw, that's not fair," John said. "You'll just prick me with a pin or something."

"Nope," Jack said. "I won't touch you, either directly or with any object. If you get out of the chair, it'll be by your own choice."

John thought, accepted the challenge, and lo and behold, Jack won the bet. How did he do it?

Ans. "John sat down in the chair and Jack ran around it 2 times then Jack stopped and said, "I'll be back in a week to run the third time around."

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Added 3 years ago

How much dirt is there in a hole in the ground that's two feet wide, three feet long, and four feet deep?

Ans. None, because its a hole.

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