The ratio of boys to girls in the 7th grade is 2:3 If there are 24 boys, how many girls are there?

You don't define the ratio, so there are two answers:
If 2/3 is boys to girls, then,
2/3 = 24/x
x = 36 girls

If 2/3 is girls to boys, then,
2/3 = x/24
x = 16 girls

(Boys) 24:36 (Girls)

If there are 24 boys then you’d divide the ratio from the boys part of the ratio (2) with the total (24) which is 12. The multiply 12 with the ratio number from the girls side of the ratio which is 3 to get the new ratio of both

2:3 ratio of boys:girls
Total: 24 boys

24(total boys) /2 (from ratio of boys) = 12 (difference)

12(difference) x 3 (from ratio of girls) = 36 (total girls)

New ratio of boys to girls is a 24:36

Note: if the ratio of boys increase then the ratio for girls increases by the same amount

D.