Average weight of 25 boys in a class is 48 kgs. The average weight of the class of 40 students is 45 kgs. What is the average weight of the 15 girls in the class?

Average weight of 25 boys in a class is 48 kgs. The average weight of the class of 40 students is 45 kgs. What is the average weight of the 15 girls in the class?

  1. 44 kgs
  2. 42 kgs
  3. 40 kgs
  4. 39 kgs
  5. 42.5 kgs

Answer – 40 kgs. Choice (3)

Solution

Total weight of boys in the class = 25 *48 = 1200 kgs

Total weight of all students in the class = 45 * 40 = 1800 kgs

Total weight of the girls in the class = 1800 – 1200 = 600 kgs

Average weight of girls = 600 / 15  = 40 kgs

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