The average weight of 40 girls sitting in a bus had some value. A new girl added to them whose weight was 60 kg only. Due to her arrival, the average weight of all the girls decreased by 20 kg. Find the average weight of first 40 boys?  Choose the correct choice from the following choices.
A) 850
B) 80
C) 176
D) 500
E) 880
40x + 60 = 41(x â€“ 20)   x = 880   880
<result>E</result>
The average weight of 40 girls sitting in a bus had some value. A new girl added to them whose weight was 60 kg only. Due to her arrival, the average weight of all the girls decreased by 20 kg. Find the average weight of first 40 boys?