the ratio of boys to girls in a science class is 5 to 4. If there are 8 girls in the class, how many boys are there?

Let's set up a ratio. Let x = number of boys

5/4 = x/8

Cross multiply

4x = 40
x = ?

x=10

To find out how many boys are in the class, we need to determine the ratio of boys to girls and use the given information that there are 8 girls in the class.

From the given ratio of boys to girls, 5 to 4, we can set up the following proportion:

5 (boys) / 4 (girls) = X (boys) / 8 (girls)

To solve for X, we cross-multiply:

5 * 8 = 4 * X
40 = 4X

Next, divide both sides of the equation by 4:

40 / 4 = X
10 = X

Therefore, there are 10 boys in the science class.