exam Maths Puzzle Numerical Ability

x(x+8)=000

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A student has scores of 67.25, 66.75, and 72.5 on his first three tests. He needs an average of at least 70 to earn a grade of C. What is the minimum score that the student needs on the fourth test to ensure a C? how would you answer this problem x+y<6
and x-y > 1