Problem at the Bank - Solution
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:
So, Why are the Totals not exactly right?
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 colum may equal £100, but is is purely coincidence that the total of the right-hand column is close to £100.
Let us show another example, but starting with £200 in the bank:
Moral of this story? Don't Total Balances.
Puzzle supplied by Richard Rider