Question

the ratio of the number of boys to the number of girls in a class is 4.5 if there are 20 boys in the class then the number of students in the class is
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Answer 1

Answer:

Ratio of boys : girls = 4 : 5

No. of boys = 20

Let the number of girls be x,

Then,

x

20

=

5

4

∴4x=5×20

⇒x=25

∴ Number of girls = 25

Answer 2

Ratio of boys:girls =4:5 (no of boys =20)

let the no of girls be x,

Then,

20/x=4/5

so,

4x=5×20

4x=100

x=100/4

x=25

so,

no. of girls =25

total no. of students = 20+25

= 45.