My question is: Marj has two $20 bills, three $5 bills, and $4.50 in loose coins in her wallet. If she buys a cake that costs $17.50, how much money will be left in her wallet? Your thoughts:
Two $20 bills amount to $20 x 2 = $40. Three $5 bills amount to $5 x 3 = $15. So, Marj has $40 + $15 + $4.50 = $59.50 in her wallet. If she buys a cake, she will be left with $59.50 - $17.50 = $42. The final answer: 42.