n2 5Ans.e mean marks of 150 students in an examination was 60. The mea

1.	n2 5Ans.e mean marks of 150 students in an examination was 60. The mean marks of boyswas tound to be 70 and that of the girls was 55. Find the number of boys and number of girls inHence, number of boys : number of girls 4:5.15. Ththe class.
Answer» let total girls be xhence boys are 150-x thus70(150-x) + 55x = 150(60)10500 - 70x + 55x = 90001500 = 15xx = 100 hence 100 girlsand 50 boys I am not able to understand this ....please do it in the paper and then send

n2 5Ans.e mean marks of 150 students in an examination was 60. The mean marks of boyswas tound to be 70 and that of the girls was 55. Find the number of boys and number of girls inHence, number of boys : number of girls 4:5.15. Ththe class.

Answer»

let total girls be xhence boys are 150-x

thus70(150-x) + 55x = 150(60)10500 - 70x + 55x = 90001500 = 15xx = 100

hence 100 girlsand 50 boys

I am not able to understand this ....please do it in the paper and then send