# Suppose you are starting an office-cleaning service. You have spent $315 on equipment. To clean an office, you use$4 worth of supplies. You charge $25 per office. How many offices must you clean to break even? ##### 1 Answer Jul 12, 2018 #### Answer: Number of offices to be cleaned to cover the cost of equipment $= 15$#### Explanation: Cost of equipment =$.315
Cost of supplies =$.4 Charge per office =$.25
Number of offices to be cleaned to cover the cost of equipment $= x$

Then -

$25 x - 4 x = 315$

$21 x = 315$

$x = \frac{315}{21} = 15$

Number of offices to be cleaned to cover the cost of equipment $= 15$