The ratio of girls to boys in French class is 5:4. There are 12 boys in the class. How many girls are there?

15

Step-by-step explanation:

5/4=15/12

15 girls

Step-by-step explanation:

G : B : total

5 : 4 : 9

? : 12:?

No. of girls = (12x5) / 4 = 15 girls

we put the ratio between girls and boys then we add the (total) or (sum) beside them in the same ratio then the summation of the ratio, like (5 + 4 = 9) and then under the word "boys" we put the number given in the question which is (12), now we need to know the number of girls in the class so we use the cross multiplication which i wrote at first.

by that, you can calculate no. of girls and no. of students in the whole class if you want.