math
posted by johnny .
Suppose you are starting an officecleaning service. You have spent $315. To clean an office, you use $4 worth of supplies. You charge $25 per office. How many offices must you clean to break even?
I don't understand this. I just made an equation, 4x + 25y = 315.

Let's do it this way.
$25  4 = $21. This is your profit for one office.
$315 / $21 = 15
You'd have to clean 15 offices to break even.
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