Problem:
In a certain school, there are three times as many boys as girls and nine times as many girls as teachers. Using the letters to represent the number of boys, girls and teachers, respectively, then the total number of boys, girls and teachers can be represented by the expression
Answer Choices:
A.
B.
C.
D.
E.
Solution:
We have and (not or ) so that and . Thus the desired sum is .