Test your Brain

[markjacob]

This is really interesting. It's kind of a brain teaser.

Condition : You must do this in your head. Don't use paper to write out the problem.

Take 1000 and add 40 to it. Now add another 1000.
Now add 30. And another 1000.
Now add 20. Now add another 1000. Now add 10.

What is the total?



[Spoiler]Did you get 5000? Most people do, but the correct answer is actually 4100. If you don't believe me, try using a calculator or writing it on paper.[/Spoiler]

Thanks.

[vaughan]

1000 + . . . . . Running total: 1000
40 + . . . . . . . . . . . . . . . . 1040
1000 +. . . . . . . . . . . . . . . 2040
30 +. . . . . . . . . . . . . . . . 2070
1000 +. . . . . . . . . . . . . . . 3070
20 +. . . . . . . . . . . . . . . . 3090
1000 +. . . . . . . . . . . . . . . 4090
10. . . . . . . . . . . . . . . . . . 4100
===== . . . . . . . . . . . . . . ====
4100 . . . . . . . . . . . . . . . . 4100

Wow

[Ototero]

I knew the problem, the brain will easily make that mistake.

Here's one: Count the letter "F" in the following sentence:

"Finished files are the result of years of scientific study combined with the experience of years"






Now read it again. There are more Fs than you realise.