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3 years, 7 months ago
3 years, 6 months ago
sum of total boys =12×30=360if two boys are replaced with average 25 of two boys, 360+sum of replaced boys-replacing boys=sum of new value360+50-replacing boys sum=12×[30+(5÷6) ]so we get 410-boys=370boys sum =40average of two replacing boys=20
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