Multiple choice

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:

  1. 65

  2. 67

  3. 60

  4. 68
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A Correct answer
Explanation

Sum of A+B+C = 65 * 3 = 195. Sum of C+B = 61.5 * 2 = 123. Sum of A+C = 68.5 * 2 = 137. Adding the two pairs: (C+B) + (A+C) = 123 + 137 = 260. Since A+B+C = 195, then C = 260 - 195 = 65.

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