Question

please send send solution

Answer 1

W be the mean weight and m and be n be boys and girls .

Wboys= sum of weights / m
Wgirls = sum of weights /n

sum of weights of boys = Wb * m =70 m
sum of weights of girls = Wg *n = 55 n

Mean Weight (W)
= (sum of boys + sum of girls) / 150

60*150 = 70m + 55n

also m + n = 150

solve both equations to get m and n.

9000 = 70(150-n) +55n = -15n +150*70

15n = 1500

n =100
m = 50