Question
The average weight of 40 students is 45 kg. If the
teacher is induded and one student is excluded, the average weight increases by 1 kg. If the weight of excluded student is 40 kg. the weight of the teacher is ?Solution
Let the weight of the teacher = x kg According to question, 40 × 45 + x - 40 = 40 (45 +1) 1800 + x - 40 = 1800 + 40 x = 80 kg.
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