Question 1022673
5.70x + 6.70(27 - x) = 162.90

==>5.70x - 6.70 = 162.90 - 6.70*27
==> -x = -18
==> x = 18
Therefore he worked 18 hours in the $5.70/hr job and 9 hours in the $6.70/hr job.