SOLUTION: A boy studies two hours a day from monday thorugh sunday. How many hours he study on sunday in order to have an avarage of 3 hours a day for the week?

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Question 1083139: A boy studies two hours a day from monday thorugh sunday. How many hours he study on sunday in order to have an avarage of 3 hours a day for the week?
Answer by Boreal(15235) About Me  (Show Source):
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2 hours*6 days=12 hours. To average 3 hours a day for a week, the total has to be 3*7=21 hours. He has to study 9 hours on Sunday.