Answer:
6 boys, 15 girls
Step-by-step explanation:
I will use B for boys and G for girls
[tex]\frac{B}{G} = \frac{2}{5} \\G = B + 9\\\frac{B}{B+9} =\frac{2}{5}\\[/tex]
Cross multiply
[tex]5B = 2(B + 9)\\5B = 2B + 18\\3B = 18\\B = 6[/tex]
There are 6 boys, so that means that there are 15 girls
A ratio of 6:15 can be simplified by dividing by 3
6/3:15/3 = 2:5
