Question

A parking lot has 45 empty space. If the ratio of empty spaces to taken spaces is 5:3, how many spaces are there total

Answer 1

$5x-\ taken\ spaces\\\\ 3x-\ empty\ spaces\\\\ 45=3x \ \ \ | divide\ by\ 3\\\\ x=15\\\\ 5x+3x=8x=8*15=120\\\\ There\ are\ 120\ spaces\ in\ total.$