Math (Basic)
posted by Kai .
"A woman earns 10.00 per hour at her job, but if she works more than 20 hours in a week she is paid 1.5 times her regular salary for the overtime hours worked. One week her gross pay was 275. How many overtime hours did she work that week?
Express your answer in hours to 2 significant figures."
I'm not sure how to start the problem. I tried something like:
10(h) + ??? = 275 hours but that doesn't seem like the right equation.

let the number of overtime hours be x
275 = 10(20) + 15x
solve for x
I got x = 5
check
20 hours at $10 = 200
5 hours at $15 = 75
total = 275 , yeahhh 
Where did you get the 15x from?

what is 1.5 of $10 ?
20 hours at $10 = 20(10) = 200
x hours at $15 = x(15) = 15x 
Oh I see. Thank you!

THIS DOESN'T HELP AT ALL!!!!