You wash dishes for a chemistry laboratory to make extra money to pay for for laundry. You earn 6 dollars/hour, and each shift lasts 75 minutes. Your laundry requires 6 quarters/load.

how many shifts must you work in order to wash 10 loads of laundry?

6 dollars for 60 min therefore for 75min

6 x 1.25=7.5 Dollars

1 dollar = 4 quarters

7.5 dollars = 30 quarters

12 quarters per load therefor you can wash 30/12 = 2.5 loads of clothes

1 shift = 2.5 loads therefore you need to work 4 shifts to wash 10 load of clothes.