Question

A textbook store sold a combined total of 312 biology and physics textbooks in a week. The number of physics textbooks sold was 54 less than the number of biology textbooks sold. How many textbooks of each type were sold

Answer 1

129 physics textbooks, 183 biology textbooks

Explanation:

Let x be the number of biology textbooks and x-54 the numbers of physics textbooks.

So:

x+(x-54)=312

2x-54=312

2x=366

x=183

So 129 physics textbooks and 183 biology textbooks were sold.