Question

There’s 18 boys and 11 girls in a class, they make a team with 7 students

a) in how many ways can they pick a team
b) how many teams can they get knowing there is 4 boys in each one?

Answer 1

"The number of boys is 45 the number of girls,"

or to say,

"The ratio of the number of boys to the number of girls is 45:1."

This second interpretation reflects the fact that 45 is the unit rate (which is a number) for the ratio 4:5.