Brain teasers

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Originally Posted by Plasnart

A man and his son were badly injured in a car crash. When they got to hospital the doctor said "I can't operate on this boy as he is my son."

How is this possible?

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The doctor was his mum??

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Originally Posted by Plasnart

Bullseye!!

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Haha, that one hurt thinking about it and then just came out...very clever!

I knew that one as well, stoopid me.

Correct Plassy, Prime numbers

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Originally Posted by Plasnart

38?
........

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I cant afford too many more Banana's Mate LOL

Quote:

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Originally Posted by Plasnart

The class whiz was asked to add all the numbers from 1-100 as fast as he could ( 1+2+3+4.....all the way to 100). After about 10 seconds he answered 5050 (which is correct).

How did he do it so quick?

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(1 + 100) + (2 + 99) + (3 + 98) + . . . . + (50 + 51) = ?

If you notice every pair of numbers adds up to 101. There are 50
pairs of numbers, so the answer is 50*101 = 5050.

Quote:

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Originally Posted by Plasnart

The class whiz was asked to add all the numbers from 1-100 as fast as he could ( 1+2+3+4.....all the way to 100). After about 10 seconds he answered 5050 (which is correct).

How did he do it so quick?

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Using the following Formulae

100 multiplied by (100+1) divided by 2 ie 10100 divided by 2 equals 5050

if it was count to 101 the answer would be 5151

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Originally Posted by Plasnart

You are a genius Paul!!

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Nope..... But I can use the internet quite well however...............................PML

Quote:

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Originally Posted by Plasnart

Ahh mate, you blew me away there for a bit! haha

EDIT: I didn't know this one would be on the internet. I was taught this one at school in about 1986!

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So was I, I just couldn't remember how it went................lol

What do you call a fish without an eye?

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Originally Posted by warnie

what do you call a fish without an eye?

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fsh..........