Question

The average weight of 40 students of class is 52kg.if the weight of the teacher is included,the average weight decrease by 200gms. the weight of decrease by 200gms. the weight of the teacher is​

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Answer 1

Answer:

the total weight of 40 students is 40×52=2080kgtotal weight decreased after adding teacher is 41×200gm=8.2 kg

total weight of 41 person is 41 ×51.8=2123.8 then,

weights of teacher =2122.8-2080.0=43.8kg

Step-by-step explanation:

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Answer 2

Answer & Step-by-step explanation:

$\frac{(52 * 40) + x }{40 + 1} = 52 - 0.2\\\\\frac{2080 + x}{41} = 51.8\\\\2080 + x = 2123.8\\\\x = 43.8 Kg$

proof

(2080 + 43.8) / 41 = 51.8

52 - 51.8 = 0.2 Kg = 200 grams