SOLUTION: The mean of the marks in Physics of 100 students of a class was 72. The mean of marks of boys was 75 while their number was 70. Find out the mean marks of girls in the class?

Question 955712: The mean of the marks in Physics of 100 students of a class was 72. The mean of marks of boys was 75 while their number was 70. Find out the mean marks of girls in the class?
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
The mean of the marks in Physics of 100 students of a class was 72. The mean of marks of boys was 75 while their number was 70. Find out the mean marks of girls in the class?
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70*75+30x/100=72
5250+30x=7200
30x=1950
x=65
mean marks of girls in the class? 65
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