### Brain Teasers

# $99

Math
Math brain teasers require computations to solve.

A bank customer had $100 in his account. He then made 6 withdrawals, totaling $100. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals........Balance Left

$50...................$50

$25...................$25

$10...................$15

$8.....................$7

$5.....................$2

$2.....................$0

___________________

$100..................$99

When he added up the columns as above, he assumed that he must owe $1 to the bank. Was he right?

Withdrawals........Balance Left

$50...................$50

$25...................$25

$10...................$15

$8.....................$7

$5.....................$2

$2.....................$0

___________________

$100..................$99

When he added up the columns as above, he assumed that he must owe $1 to the bank. Was he right?

### Answer

There is no reason whatever why the customer's original deposit of $100 should equal the total of the balances left after each withdrawal. The total of withdrawals in the left-hand column must always equal $100, but is purely coincidence that the total of the right-hand column is close to $100.Hide Answer Show Answer

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## Comments

this is a variation on a rather worn trick. It's just adding up insignificant numbers.

i dont get it...

If you don't get it, look at this scenario with only 2 withdrawals:

Withdrawals........Balance Left

$50.................$50

$50.................$0

___________________

$100................$50

Would you expect $100 = $50 ?

Withdrawals........Balance Left

$50.................$50

$50.................$0

___________________

$100................$50

Would you expect $100 = $50 ?

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