Answered

The ratio of the number of boys and girls in a class is 3:5. Find the number of girls , if the total number of students in the class is 40.

Sagot :

Let boys be 3x
      Girls be 5x
      Total = 40

ADD:
3x + 5x = 40

8x = 40

8x/8 = 40/8

x = 5

Substitute 5 for x:

Boys: 3x= 3(5) = 15,  number of boys

Girls:  5x= 5(2) = 25, number of girls

To Check:

15 + 25 = 40
        40 = 40