Question

the mean weight of students in a class is 46 kg.the mean weight of boys is 50 kg and that of girls is 40 kg .the ratio of the boys is to girls is how much

Answer 1

The total number of students in the class is not given in the question
so can't answer to this

Suppose,
The total number of students in the class is 100

Let number of boys are x and then number of girls = (100-x).
Thus,
50x+(100-x)*40 = 46*100
→ x = 60.
Number of boys = 60.
Number of girld = 100 - 60 = 40

So the ratio is 6:4