In Mr. Martinez's class there are 8 boys and 12 girls. What is the probability of randomly selecting a girl?

3/5

There are 20 students in total. However, only 12 are girls. So, you get the probability of 12/20, but that can be simplified further. A factor of both 12 & 20 is 4, so divide each number by 4 and you get the fraction 3/5.

3/5

Step-by-step explanation:

there are 20 people altogether in the class (12 plus 8)

since 12 of them are girls the probability it 12/20

but to simplify it we divide both sides of the fraction by 4 (as that's the largest whole number they will both divide by) and we get 3/5