Average = Sum of weights ∕ Number of weights Calculations: Let the weights of Mandar, Ketan, and Tushar be M, K, and T respectively.
M+K+T
3
=45 ⇒M+K+T=135
M+K
2
=43 ⇒M+K=86
K+T
2
=48 ⇒K+T=96 We have three equations: M+K+T=135 M+K=86 K+T=96 Subtracting equation (2) from equation (1): ⇒(M+K+T)−(M+K)=135−86 ⇒T=49 Put the value of T in equation (3) ⇒K+49=96 ⇒K=47