SOLUTION: a plumber charges $70 for the first thirty minutes plus $4 additional minute that she works. the plumber charged kyle $122 for her time. what amount of time in minutes did plumber

Algebra ->  Customizable Word Problem Solvers  -> Finance -> SOLUTION: a plumber charges $70 for the first thirty minutes plus $4 additional minute that she works. the plumber charged kyle $122 for her time. what amount of time in minutes did plumber       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 956970: a plumber charges $70 for the first thirty minutes plus $4 additional minute that she works. the plumber charged kyle $122 for her time. what amount of time in minutes did plumber work

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +t+ = time in minutes the plumber worked
+122+=+70+%2B+%28+t+-+30+%29%2A4+
+122+=+70+%2B+4t+-+120+
+242+-+70+=+4t+
+172+=+4t+
+t+=+43+
------------
The plumber worked 43 min
check:
+122+=+70+%2B+%28+43+-+30+%29%2A4+
+122+=+70+%2B+13%2A4+
+122+-+70+=+52+
+52+=+52+
OK