Question

Avg wt. of a group 0f 6 is 63, whne a man leaves the avg. becomes 60, find the man's weight

Answer 1

sum of 6 = x
x/6 =63
x=63×6
x= 378

now sum of 5 =y
y/5 =60
y=60×5
y=300
y+1 =x
so 300+ 6th man = 378
6th man =378-300=78 kg