exam Maths Puzzle Numerical Ability

A manufacturing firm makes two types of printers, an ink jet printer and a laser printer. It can make a total of only 8 printers per 24-hour day. It takes 2 hours to make an in

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A bookstore manager plans to spend $60 on pens at 30 cents each and penciles at 10 cents each. The equation 0.10x+0.30y=60 can be used to model this situation.

a) what do x and Heather recieved grades of 80, 75, and 86 on three algebra tests. What must her grades be on the next test if her average for the four tests is to be at least 82..
I need help setting this up.. thanks