Question

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.

• A. 55 kg
• B. 60.5 kg
• C. 57.5 kg
• D. 60

Answer 1

Answer:

C. 57.5 kg

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