Question

Aaron puts $500 into the bank. Everyday he takes out $12 out of the bank for lunch. How many days will it take to have $140 left in Aaron bank account?

Answer 1

30 days

Explanation:

If d represents the number of daily withdrawals, then Aaron's bank balance (b) is given by ...

b = 500 -12d

We want to find d that corresponds to b=140, so we fill in that value and solve.

140 = 500 -12d

-360 = -12d . . . . . . subtract 500

30 = d . . . . . . . . . . . divide by -12

It will take 30 days to have $140 left in Arron's bank account.