Given:
The average weight of 27 students of a school is 53 kg.
Solution:
Total weight of 27 students = 27 × 53 = 1431 kg
The new average weight of 28 people (27 students + 1 teacher) becomes:
New average weight = 53 + 0.7 = 53.7 kg
Total weight of 28 people = 28 × 53.7 = 1503.6 kg
Weight of teacher = Total weight of 28 people - Total weight of 27 students
Weight of teacher = 1503.6 kg - 1431 kg = 72.6 kg
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