Question

The average weight of A, B and C is
80 kg. If D joins the group, the
average weight becomes 84 kg.
When E joins the group, the
average weight becomes 3 kg more
than the group, where D replaces
A. Find the weight of A. (RKM, 2005)​

Answer 1

Answer:

(a+b+c)/3=80

a+b+c=80*3

a+b+c=240

(a=b=c)

a=26.66=b=c

we joining d, then value avg value=84

a+b+c+d=84

a+b+c+d=84*4=336

d=336-240=96