Question

In a school, 3/7 of the students are girls, and the number of boys is 560. Find the number of girls

Answer 1

GIVEN

3/7 of the students are girls

Number of boys is 560

Let say total number of student is x

Number of girls = 3x/7

Total students = Number of boys + Number of girls

x = 560 + 3x/7

7x = 3920 + 3x

4x = 3920

x = 980

Number of girls = 3x/7 = 420

Answer 2

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4 / 7 = x / 560

Cross-multiply:

• 7x = 2240

Divide by 7:

• x = 320

• The school has 320 boys and 560 - 320, or 240 girls.

Check:

• Ratio of boys to girls:

• 320 / 240 = 4 / 3