Ratios for math

Question

If there is a ratio of 3 boys to 4 girls in a class which of the following are correct for the class ?

3 boys to 7 students

4 girls to 3 boys

3 boys to 7 girls

4 girls to 7 students

Answer 1

If the ratio boys to girls is 3/4, then the ratio of boys to students is 3/7, the ratio of girls to boys is 4/3, and the ratio of girls to students is 4/7 so the only one that is incorrect is the third one (3 boys to 7 girls)