Multiple choice

The average of a group of 15 members initially increases from 60kg to 65 kg when A, B and C join the group. The weight of A, B and C are in the ratio 3 : 4 : 2. What is the difference between weight of A and C?

  1. 40 kg

  2. 45 kg

  3. 20 kg

  4. 30 kg
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Initial sum = 15 * 60 = 900. New sum = 18 * 65 = 1170. Sum of A, B, C = 1170 - 900 = 270. Ratio 3:4:2 means 9 parts = 270, so 1 part = 30. A = 3*30=90, C = 2*30=60. Difference = 30.

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