Question 121521
You can set up a proportion to help sovle this kind of problem:
Let H = the number of students who rode horses to school and W = the number of students who walked to school, then you can write:
{{{H/W = 2/9}}}
Now you can substitute the W with 18 since that is the number of students who walked to school:
{{{H/18 = 2/9}}} Now you can solve this for H, the number of students who rode horses to school:
{{{H/18 = 2/9}}} Multiply both sides by 18.
{{{H = 2(18)/9}}}
{{{H = 4}}}
The number of who rode horses to school was 4.