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25 students average 84 on a test. another group of 20 students averages 66. find the overall average.

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  1. Today, 03:10
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    84*25=sum of all 25 students marks

    66*20=sum of 20 students marks

    total average = (84*25+66*20) / 25+20

    = (2100+1320) / 45

    = 3420/45

    =76
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