JOAN AND SUSAN WENT SHOPPING WITH 15 DOLLARS EACH JOAN SPENT 6 DOLLARS AND 4 CENTS LESS THAN SUSAN AND HAD 4 TIMES AS MUCH LEFT THAN SUSAN HAD LEFT AT THE END OF THE DAY. CALCULATE HOW MUCH JOAN HAD LEFT AT THE END OF THE DAY.

Solution:

John: x-6.04

Susan: x

So

15-x+6.04 = 4(15-x)

x=12.99

So John left 8.05 dollars