First, how many boys are in the Billy's class room? We know there are a total of 40 students and 18 girls. That means 22 are boys because 40 - 18 = 22.
The 40 students represents 100% of the class room.
[tex]\frac{40}{40}[/tex] = 1
To convert into a percentage, multiply by 100.
1 * 100 = 100%
We can use the same reasoning to get the percentage of the boys.
[tex]\frac{22}{40}[/tex] = 0.55
Multiply by 100.
0.55 * 100 = 55%
So, 55% of the students are boys.
