Multiple choice

Average weight of group of 11 students is 37 kg. When a student left the group, then average weight of the group becomes 35 kg. What is the weight (in kg) of the student who left?

  1. 65

  2. 59

  3. 57

  4. 70
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total weight of 11 students = 11 × 37 = 407 kg. After one leaves, total weight of 10 students = 10 × 35 = 350 kg. The difference gives the weight of the student who left: 407 - 350 = 57 kg. This method uses average = total/count.

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