The average weight of A, B and C is 65 kg. If the average weight of C and B is 61.5 kg, and the average weight of A and C is 68.5 kg, then the weight of C (in kg) is:
Answer & explanation
Correct answer: option 1
Sum of weights of A, B and C = 65 x 3 = 195 ....(1)
Sum of weights of B and C = 61.5 x 2 = 123 .....(2)
Sum of weights of A and C = 68.5 x 2 = 137 .....(3)
Solving (1), (2) and (3)
Weight of A
⇒ 195 - 123 = 72
Weight of C
A + C = 137
⇒ C = 137 - 72 = 65 kg
∴ Weight of C is 65 kg