Question

You wash dishes for a chemistry laboratory to make extra money for laundry. You earn 12 dollars/hour, and each shift lasts 75 minutes. Your laundry requires 12 quarters/load. How many loads of laundry will each shift pay for if the cost per load rises to 16 quarters?

Answer 1

For each shift, you will earn 12/60*75=15 dollars=60 quarters. If the laundry is 12 quarters per load, you can make 60/12=5 loads. If the laundry is 16 quarters, you can make 60/16=3.75 loads. You can pay only 3 loads.