When a boy weighing 47 kg left a group, the average weight of the remaining 49 students increased by

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20 Jan 2022 Average

When a boy weighing 47 kg left a group, the average weight of the remaining 49 students increased by 300g. What is the average weight of the remaining 49 boys?

OPtion

1) 60.7
2) 60.3
3) 61.7
4) 61.3
5) 60.5
6) 62
7) 60
8) 61
9) 63
10) None of these

Solution

After leaving of a boy, remaining boys are 49 i.e. There were earlier 50 boys.
Let the average of 50 boys be 'x' kg, then their total weight = 50x
Average of remaining 49 boys = (50x - 47)/49 = x+0.3
50x - 47 = 49x + 14.7
x = 61.7
Therefore, average of remaining 49 boys = 61.7 + 0.3 = 62 kg.

Correct Option: 6 Best Solution (1)

G.S.Kantharao   2 years AGO

Let x is the average of 50
Then 50x-47
=49(x+0.3)=49x+14.7
Now x=61.7
Average of 49=61.7+0.3=62
My option is 6👈

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