SOLUTION: Christopher has completed three mathematics tests. his mean mark is 69%. what percentage mark does he have to get in his next test to increase the mean to 70%?

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Question 1084173: Christopher has completed three mathematics tests. his mean mark is 69%. what percentage mark does he have to get in his next test to increase the mean to 70%?
Answer by josgarithmetic(39616) About Me  (Show Source):