Question

A textbook store sold a combined total of 435 psychology and sociology textbooks in a week. The number of sociology textbooks sold was 61 less than the number of psychology textbooks sold. How many textbooks of each type were sold?

Answer 1

248 psych books, 187 soc books.

Explanation:

x psych books were sold

x-61 soc books were sold

Total books was 435.

So -

x+x-61 = 435

2x-61 = 435

2x = 496

x = 248.

so x-61 = 187 and

248+187 = 435.

248 psych books, 187 soc books.