The average weight of A. B and Cis 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.
Answers
Answered by
1
Answer:
From question
A + B + C = 3 x 84 = 252 ....(i)
A + B + C + D = 4 x 80 = 320 ...(ii)
From eq. (ii) - (i)
D = ( 320 - 252 ) = 68
From question E = D + 3
⇒ E =( 68 + 3 ) = 71
Now , B + C + D + E = 4 x 79 = 316
∴ B + C + D = 316 – 71 = 245
So , A = 320 - 245 = 75 kg .
Similar questions