Question

Write an equation to find the number of students in Mr. Boggs' homeroom if the total number of students is 90.

Teacher: Number of students
Mr. Boggs b
Mr. Hamilton 15(b+2)
Ms. Simpson 15
Mrs. Walton 2b-9

Answer 1

15(b+2) + 15 + 2b-9 +b = 90

Explanation:

Essentially you add up all of the values and make it equal to 90, then solve for b

15(b+2) + 15 + 2b-9 +b = 90

15b + 30 + 15 + 2b - 9 + b = 90

18b + 30 + 15 - 9 = 90

18b + 36 = 90

18b = 54

b=3