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Possible Duplicate:
Riddle (simple arithmetic problem/illusion)

Three men go to a shop and take some food which is cost $25. Waiter came and gave them bill.

Each of them gave $10. So, waiter take total 
$10+$10+$10=$30.
Waiter came back with
$5
. Three men took
$1+$1+$1
and they decide to gave rest $2 to waiter. Now if we calculate the above thing then it should look like this:

 Man A total spend $10 - $1  = $9 Man B total spend $10 - $1  = $9 Man C total spend $10 - $1  = $9 Three men Total = $27 and waiter take =    $2 So , three men total + waiter = $27 + $2 = $29 !!!!   Where is another Dollar gone! Can anybody please explain it for me please?

  • 0
    Word problems in secondary school math have this feel. The problem is like magic, misdirection by using words that are mostly correct but point away from a correct assessment of the reality.2011-02-04

2 Answers 2

4

The wrong numbers are added and subtracted. It should be:

The men pay 30

The waiter gives 3 back, so the men paid 27 and the waiter got 27

The food was 25, so the waiter can keep 2 dollars.

  • 2
    The total is indeed 25, but the men paid 30. The waiter *should* give 5 back, but keeps 2 of these 5, thus giving 3 back.2011-02-04
2

The $\$27$ includes the $\$25$ they paid for food, plus the $\$2$ to the waiter. They pocketed the other three dollars.