I got 2 equations here .
Let x be the number of successful lightning fixtures
Let y be the number of broken lightning fixtures .
12 dozen = 144
---- 1
------ 2
Solve for y ..
An apprentice unpacked 12 dozen fragile lighting fixtures. He was to receive $3 for each fixture that he unpacked safely and he agreed to pay $25 for every one that he broke. If the amount due him for his work was $236, how many did he break?