Question

The ratio of boys to girls in math classes is 3.5. If there are 130 girls in these classes, how many boys must there be?

Answer 1

Required Answer:-

The ratio of boys and girls =3:5

Let

Number of boys=3x

Number of girls =5x

• According to the question Numbers of girls=130

`{:}\longrightarrow`
`\sf 5x=130`

• Now interchange both sides and get x

`{:}\longrightarrow`
`\sf x={\frac {130}{5}}`

`{:}\longrightarrow`
`\sf x=26`

Now

The number of boys=3x

=3×26=78

`\therefore`Number of boys is 78.