Question

A’s weight equals the average weight of B, C and D.

B’s weight equals the average weight of A, C and D.

The average weight of C and D is 30 kg. Find the

average weight of A and B.​

Answer 1

Step-by-step explanation:

A's weight = B+C+D /3, B's weight = A+ C+D /3 , C+D /2 = 30 , A+B /2 = ? . Here B+C+D = 3A, A+C+D = 3B , we get (B+C+D)+( A+C+D) = 3A+3B , On solving we get A+ B = C+D , Therefore average weight of A and B = A+B /2 = C+D/2 = 30. Answer.