In a class the average weight of 150 students is 80 kg. The average weight of boys and girls is 85 kg and 70 kg respectively. The number of girls in the class is-
A. 60
B. 70
C. 50
D. 80
Answer:C
In a class the average weight of 150 students is 80 kg. The average weight of boys and girls is 85 kg and 70 kg respectively. The number of girls in the class is-
A. 60 B. 70 C. 50 D. 80