Multiple choice

The average weight of M, N and O is equal to 65 Kg. The average weight of M and N is equal to 69.5 kg. The average weight of N and O is 66.5 kg. What is the weight of N in kg?

  1. 70

  2. 73

  3. 75

  4. 77

  5. 80
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let weights be M, N, O. We know: M+N+O=195, M+N=139, N+O=133. Subtract M+N=139 from total: O=56. Subtract N+O=133 from total: M=62. Then N=195-62-56=77. Substitute to verify: M+N=62+77=139 (correct), N+O=77+56=133 (correct).

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