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 weight of A??????

Answer 1

average weight of a b and c = 80 kg
weight of a + b + c /3 = 80 kg
sum of weight of a b and c = 80 kg × 3
= 240kg
average weight when d join group = 84 kg
sum of weight of a b c and d = 84kg × 4
= 336kg
therefore mass of d = 336kg - 240kg
= 94 kg
when is e join the group the average weight become 3 kg more than the group where d replace a.
weights of a b c e /4 = 83 kg
weight of a = 83×4 - 240kg
=342 kg - 240kg
= 112 kg.
Hope it helps you.

Answer 2

Answer:

Step-by-step explanation: