alleryStart learning →Twenty students average 40 kg. Adding the teacher makes the mean 41 kg. Teacher weighs:
A60 kg
B61 kg
C51 kg
D56 kg
Answer & Solution
Correct answer: B. 61 kg
The 21 people weigh 21 x 41 = 861 kg and the students weigh 800 kg, so the teacher weighs 61 kg.
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