SOLUTION: A student scores marks of 66 and 72 on two tests. What is the lowest mark she can obtain on a third test to have an average for the three tests greater than or equal to 75?
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Question 711070: A student scores marks of 66 and 72 on two tests. What is the lowest mark she can obtain on a third test to have an average for the three tests greater than or equal to 75? Answer by lwsshak3(11628) (Show Source):
You can put this solution on YOUR website! A student scores marks of 66 and 72 on two tests. What is the lowest mark she can obtain on a third test to have an average for the three tests greater than or equal to 75?
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let x=lowest mark on the third test
(66+72+x)/3≥75
132+x≥225
x≥225-132
x≥93
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