percentage circle math word problem

Question

percent circle shows study requirements for 1 week for each class. chemistry 40%, history 22%, ethics 13%, calculus 25%. if 6 hours is spent this week studying chemistry, how many hours will be needed to study this week for all classes?

Answer 1

Total hours X percentage of Chem = Hours for Chem

--> Total hours = Hours for Chem ÷  percentage of Chem

--> Total hours = 6 ÷ 40% = 15 hours