I had been planning to work for 20 hours a week for 12 weeks this summer to earn to buy a used car. Unfortunately, I got sick for the first two weeks of the summer and didn't work any hours. How many hours a week will I have to work for the rest of the summer if I still want to buy the car?
So 240 hours in total needed
You lost 2 weeks so you have 10 weeks left
Now 10 weeks and you need 240 hours
240/10 = 24
So you have to work 24 hours a week.