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RiddlesDb ยป Math

How long will it take 100 cats to kill 100 rats

By admin

If 3 cats can kill 3 rats in 3 minutes, how long will it take 100 cats to kill 100 rats?

Answer
It will take 3 minutes for 100 cats to kill 100 rats. 1 cat can kill 1 rat in 3 minutes, so 100 cats can kill 100 rats in 3 minutes.

Filed Under: Math Tagged With: Animal, Cat, Number

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There is a three digit number

By admin

There is a three digit number. The second digit is four times as big as the third digit, while the first digit is three less than the second digit. What is the number?

Answer
141.

Filed Under: Math Tagged With: Number

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In a lake there is a patch of lily pads

By admin

In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half the lake?

Answer
The patch doubles in size every day and so on the 47th day the patch will be half the size it is on the 48th day.

Filed Under: Hard, Math

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How many fingers are there on 10 hands?

By admin

Take a good look at your hands. You have 10 fingers on your hands. How many fingers are there on 10 hands?

Answer
100 is the wrong answer. The correct answer is 50 fingers, 10 hands X 5 fingers.

Filed Under: Math, Tricky Tagged With: Number

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What number do you get

By admin

What number do you get when you multiply all of the numbers on a telephone’s number pad?

Answer
0.

Filed Under: Math Tagged With: Number

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There was a girl half my age when I was 12

By admin

There was a girl half my age when I was 12, now I am 64, how old is she?

Answer
58, half of 12 is 6 so 64-6 is 58.

Filed Under: Math

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