How many of each type of book did she buy?

Question

Karla bough 6 books for a total of $154. Math books cost $27 and English books cost $23.

Answer 1

Let x = the number of math books that Karla bought

Let y = the number of English books that Karla bought

x + y = 6       x = 6 - y

27x + 23y = 154

27(6-y) + 23y = 154

162 - 27y + 23y = 154

-4y = -8

y = 2

x = 6 - y = 6 - 2

x = 4