A school purchased a batch of t-shirts from a company. the company charged $6 per t-shirt, and gave the school a $85 rebate. if the school had a net expense of $2,255 from the purchase, how many t-shirts did the school buy?

390 shirts

Explanation:

if actual expense is 2255 then this expense is actually the cash paid to the shirt company. So, the actual amount to be owed by the school will be

2255+85 = 2340

Now in order to calculate the number of shirts we need to divide this total amount by price of one shirt.

2340/6 = 390 shirts

390 shirts

Solve for x, number of shirts

$2,255 = $6x - $85 rebate

(add 85 to both sides)

$2340 = 6x

(divide by 6)

2340/6 = 390 shirts