Scholastic Books sells 4 times as many textbooks as Keller Publishing; together they sold 7,775 textbooks. How many did Scholastic sell?
A)9,330
B)1,555
C)6,220
D)6,022
E)None of these

Question

Quizplus · Accepted Answer

Let's call the number of textbooks Keller Publishing sold "x". 
According to the problem, Scholastic sold 4 times as many textbooks, so they sold 4x textbooks. 
We know that together they sold 7,775 textbooks, so we can set up an equation: 
4x + x = 7,775 
Simplifying, we get: 
5x = 7,775 
x = 1,555 
So Keller Publishing sold 1,555 textbooks 
And Scholastic sold 4 times as many: 4(1,555) = 6,220 
Therefore, the answer is C.

Scholastic Books Sells 4 Times as Many Textbooks as Keller