In a certain class of students, there are 11 boys from wilmette, 7 girls from wilmette, 5 boys from winnetka, 4 girls from winnetka, 4 boys from glencoe, and 4 girls from glencoe. if the teacher calls upon a student to answer a question, what is the probability that the student will be a boy

Probability that a boy will answer the question =

Step-by-step explanation:

In a certain class of students,

Number of boys from Wilmette = 11

Number of boys from Winnetka = 5

Number of boys from Glencoe = 4

Total boys in the class = 11 + 5 + 4 = 20

Similarly, total number of girls in the class = 7 + 4 + 4 = 15

Total number of students in the class = 20 + 15 = 35

Now number of ways we can choose 1 boy out 20 boys

=

Similarly number of ways, we can choose a boy out of 35 students =

Now the probability that a boy will answer the question =

=

the third picture

step-by-step explanation: