Question

A textbook store sold a combined total of 288 history and sociology textbooks in a week. The number of history textbooks sold was three times the number of sociology textbooks sold. How many textbooks of each type were sold?

Answer 1

x = number of sociology textbooks

3x = number of history textbooks

A textbook store sold a total of 288 history and sociology textbooks in one week

→x+3x=288

4x=288

x=288/4=72

How many textbooks of each type have been sold?

number of sociology textbooks: 72

number of history textbooks: 216