Question

if two new students of weight 51.5kg and 50 kg are joind then the average becomes 54kg in a class find the number of students in the beginning.
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Answer 1

Answer:

number of students were 13  in the beginning

Step-by-step explanation:

Complete Question :

if two new students of weight 51.5kg and 50 kg are joined then the average becomes 54kg from 54.5 kg in a class

find the number of students in the beginning

Let say number of students in beginning = N

Average Weight = 54.5 kg

total weight = 54.5N kg

two new students of weight 51.5kg and 50 kg are joined

so New total Weight = 54.5N + 51.5 + 50  = 54.5N + 101.5 kg

New Mean = 54 kg

Nos total Students = N + 2

Total new weight = 54(N + 2) = 54.5N + 108  kg

54N + 108 = 54.5N + 101.5

=> 0.5N = 6.5

=> N = 13

number of students were 13  in the beginning

Answer 2

Answer:

how to come 54.5 kg... two new students are added but this 54.5 are that two students average