Question

the cost C (in dollars) of making n watches is represented by C = 15n + 85. How many watches are made when the cost is $385?

Answer 1

20 watches are made since 385 = 15n + 85. 385 - 85 is 300 and 300 divides by 15 is 20.

Answer 2

I believe the answer is 20.

C= 15n + 85

$385= 15n+85

$385-85= 300

300/15= 20