Multiple choice

The average weight of a class of 29 students is 35 kg. If the weight of the teacher is included, the average weight rises by 500 g. The weight of the teacher is

  1. 14.5 kg

  2. 50 kg

  3. 35.5 kg

  4. 70.5 kg

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total weight (only students) = 35*29 = 1015 kg

Let the weight of the teacher be y.

Then, (1015 + y)/30 = 35.5

1015 + y = 1065

y = 50 kg

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