Question

In a school , there are 250 girl and 700 boys . Find the ratio of the number of boys to the number of girl​

Answer 1

Let the Original number of boys and girls in the school be 7x and 15x respectively.

Number of boys +Number of girls = 770

⇒ 7x + 15x = 770

⇒ 22x = 770

⇒ x = 35

∴ Number of boys = 7x

 = 7 × 35

 = 245 boys.

Number of girls = 15x 

= 15 × 35

= 525 girls.

Now, Let the number of boys admitted be y.

∴ New number of boys = 245 + y

According to the Question,

New Number of boys/Number of girls = 1/1

∴ (245 + y)/525 = 1/1

⇒ 245 + y = 525

⇒ y = 525 - 245

⇒ y = 280.

Hence, the number of boys admitted to make the ratio of the number of boys to number of girls 1 : 1 is 280.