Question

average height of 30 boys out of class 50 is 160cm if the average of the remainder bous 160 cm the average heoghy of whole lclass is
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Answer 1

Answer:

answer is 160cm

Given

average of 30 boys height=160 cm

average of 20 boys height=160 cm

then average of 50 boys will be in the picture

Answer 2

the average height of whole class=160cm

Explanation :

average height of 30boys= sum of heights(x)/30

160=x/30

x=160X30

x=4800cm

average of 20 boys=sum of heights of remaining 20boys(y)/20

160=y/20

y=160X20

y=3200cm

average height of whole class =(x+y)/50

=4800+3200/50

=8000/50

=160cm

thanks