The average weight of Tushar, Salil and Mukund is 45 kg. If the average weight of Tushar and Salil be 43 kg and that of Salil and Mukund be 44 kg, then the weight of Salil (in kg) is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 39.
(T + S + M) / 3 = 45
⇒ T + S + M = 135 ⇒ (T + S) / 2 = 43 → T + S = 86
⇒ (S + M) / 2 = 44 → S + M = 88
⇒ (T + S) + (S + M) = 86 + 88 = 174
⇒ T + 2S + M = 174
⇒ (T + 2S + M) − (T + S + M) = 174 − 135
⇒ S = 39