I have a word problem I can't solve. Please help?
A Plumber charged $110 for a three-hour job and $160 for a five-hour job. At this rate, how much would he charge for an 8-hour job?
Thanks in advance.
Follow Math Help Forum on Facebook and Google+
Let a be the initial cost, and b be the cost per hour. Then:
a + 3b = 110
a + 5b = 160
Solve the system for a and b; your answer will be a + 8b.
View Tag Cloud