The ratio of girls to boys in a class is 7:3. If there are 35 girls ls in the class, how many boys are in the class?
We can use a proportion to solve this problem.
Since the ratio of girls to boys is 7:3, we can write:
7/3 = 35/x
where x is the number of boys in the class.
To solve for x, we can cross-multiply:
7x = 105
x = 15
Therefore, there are 15 boys in the class.