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  9. Q4

CGPSC 2011 · Question 4 of 146

In a class the average weight of 150 students is 80 kg. The average weight of boys and girls is 85 kg and 70 kg respectively. The number of girls in the class is

Averages

  1. A60
  2. B70
  3. C50Correct
  4. D80

Answer: C. 50

Explanation

By alligation: (85-80):(80-70) = 5:10 = 1:2 boys to girls, so girls = 150 x 2/3 = 100? No — ratio boys:girls = (80-70):(85-80) = 10:5 = 2:1, so girls = 150/3 = 50.

Source: CGPSC PCS Prelims 2011 GS Paper, solved paper via iasexamportal.com

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