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Question

Dear All, 

Please help to solve this question . 

 

Thank you . 

Answer

Total score at first -> 78x

Total score after next test -> 80(x+1)

Score for next test -> 80(x+1) – 78x = 80x + 80 – 78x = 2x + 80

 

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Total marks for x number of tests = 78x

Her total marks for next test must be 80x to get an average of 80. 

 

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