Question

2. The ratio of boys to girls in a classroom is 2 to 3. If there are 18 boys in the classroom, how many

girls are there?

Answer 1

27 girls

Explanation:

boys 2/5 = 0.4 (40%) = 18

girls 3/5 = 0.6 (60%)= x

40%----------18

60%-----------x

Cross multiplication

40x = 60x18

40x = 1080

x=27

Answer 2

27 girls

Explanation:

boys 2 : 3 girls

18: x

18×3= 54:2x

54÷2= 27