Average of marks scored by Abeer in nine monthly tests of 100 marks each is 68. What should be the average marks in the last three-monthly tests of 100 marks each to make his overalt average of 75 in 12 monthly tests?
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Step-by-step explanation:
average marks in the last three monthly test
{(75×12)-(68×9)}/3
=(900-612)/3
=288/3
=96
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