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Twister92

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I talked to an elderly man at a store today. He taught me about very intresting math problem, and other things. But this is what the math problem is like:

 

Pick a whole number (interger for you algebra-types), preferably 1 to 9. (example: 5)

Double. (example: 5 x 2=10)

Add four. (example: 10 + 4=14)

Divide by two. (example: 14/2=7)

Subtract by the number you picked. (example: 7-5=2)

 

You will always come out with two, no matter what number you picked-even if you picked zero! I just thought this would peek your intrest.

 

God bless.

~Tahima~

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Right, let's take a look at that...

 

You start by picking a number: let's call it n.

When you double it, that makes 2n.

Adding 4 gives you 2n+4.

Dividing by 2 makes that n+2.

Subtracting n leaves you with 2.

 

It looks like it should also work in n isn't an integer. Let's try with 1.519:

 

Pick a number: 1.519

Double it: 3.038

Add 4: 7.038

Divide by 2: 3.519

Subtract the original number: 2

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