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)
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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
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