Maths Equation Riddle

Prove that the below maths equation is true.

8 + 8 = 91




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

Withdrawals Balance left
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----- -----
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What numbers should go on the bottom line?
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? ? ? ?

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