Question

there are four kinds of road signs in a certain town. the number of each kind is shown. what is the ratio of the number of school signs to the number of stop signs?
stop signs-10 railroad signs- 3
yield signs-2 school signs-9

1. 9 to 10
2 10:9
3 10 over 24
4 9:24

Answer 1

what is the ratio of the number of school signs to the number of stop signs?

ratio is written as first number divided by the second number,
OR
first number : second number
OR
first number TO second number

in your problem, the first number is the number of school signs
the second number is the number of stop signs