Question

23. The ratio of girls and boys in a class is 1 : 3. Set up an equation between the students of a class and boys and then draw its graph and find the number of boys in a class of 40 students. (CBSE SP 2011]​

Answer 1

Answer:

let the no. of boys be 3x

and no. of girls be 1x

1x + 3x = 40

4x = 40

x = 10

No. of boy

s = 3x

=3 × 10

= 30