exam Maths Puzzle Numerical Ability

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

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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 Word phrase: What is the Quotient of 6 and a number t? I am in the 8th grade and, I really need some help. And it is greatly appreciated;thanks Kim.