SOLUTION: student wrote three papers in the mathematics examination.Her marks for two papers were 77 and 72 respectively.To obtain grade A,an average of not less than 75 is required for the

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Question 1163488: student wrote three papers in the mathematics examination.Her marks for two papers were 77 and 72 respectively.To obtain grade A,an average of not less than 75 is required for the three papers.How many marks must she get in the third paper to get a grade A.
Answer by josgarithmetic(39623) About Me  (Show Source):
You can put this solution on YOUR website!
100%3E=%2877%2B72%2Bt%29%2F3%3E=75
Simplify and solve.