Average weights of 12 students in a class is 30kgs. two boys are left and two boys are joined with average of 25.if new average is (30+5/6) what is average of two boys left?

Question

Answer 1

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

Answer 2

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

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Average weights of 12 students in a class is 30kgs. two boys are left and two boys are joined with average of 25.if new average is (30+5/6) what is average of two boys left?