The average weight of 27 students of a class is 53 kg. If the weight of the teacher is included, the average rises by 700 grams. Find the weight (in kg) of the teacher.
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Correct answer: D
Explanation
The correct answer is Option 4 i.e. 72.6.
Total weight of 27 students = 27 × 53 = 1431
New average = 53.7
Total with teacher = 28 × 53.7 = 1503.6
Teacher’s weight = 1503.6 − 1431 = 72.6 kg