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The average weight of a class of 30 students is 42 kg. If the weight of the teacher be included, the average weight increases by 500 g. Find the weight of the teacher.

A55 kg

B60.5 kg

C57.5 kg

D60

Answer:

C. 57.5 kg

Read Explanation:

Total weight of 30 students = 30 × 42 = 1260 kg Average weight of 30 students and teacher = (42 + 0.5) kg = 42.5 kg total weight of 30 students and the teacher = (42.5 × 31) = 1317.5 kg Weight of teacher = (1317.5 - 1260) kg = 57.5 kg


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