Question

The mean weight of 150 students in a class is 60kg.The mean weight of boys in the class is 70kgs and that of grils is 55kgs. Find the number of girls in the classroom

Answer 1

Hey there......

Apply allegation method you will get ratio boys and girls. Divide total number of students in given ratios.
70 55
60
5 10
Boys girls (avg 60-55&70-60)

Ratio is 1 : 2

Total students 150 so applying ratio hence boys 50 and girls 100.
This method is much simpler here to explain it we have used the steps. In exams just by looking at the question you can solve without using pen.

HOPE IT HELPS ☺

Answer 2

Answer:

your ans

Explanation:

Total ratio = 150

boy = 50

girl = 100