The average weight of 39 students is 40 kg. If the weight of their teacher is also included, the average weight is increased by 800 gms. The weight of teacher will be ?
(A) 72 kg
(B) 74 kg
(C) 75 kg
(D) 82 kg
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Answer:
(c) 72 kg
Explanation:
Average = Sum / Count
Sum = Average * Count
Average weight of 39 students= 40 kg
Total weight of 39 students = 39 * 40 = 1560 kg
Average weight of 39 students plus teacher = 40.8 kg (increase of 0.8 kg or 800 g, as given)
Total weight of 39 students & teacher = 40.8 * 40
= 1632 kg
Weight of teacher = 1632 - 1560 = 72 kg
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