The average weight of 45 students of a school is 55 kg. If the weight of the teacher be included, the average weight rises by 500 grams. Find the weight (in kg) of the teacher
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Correct answer: A
Explanation
The correct answer is option 1 i.e. 78.
Total weight of the 45 students = 45 × 55 = 2475 kg
New average weight = 55 + 0.5 = 55.5 kg
Total weight of the 45 students and the teacher = 46 × 55.5 = 2553 kg
Weight of teacher = 2553 - 2475 = 78 kg