Question 159455
"The plumber worked 3 hours more than the apprentice"  __  p=a+3


"together they were paid $213"  __  28p+15a=213


substituting  __  28(a+3)+15a=213  __  28a+84+15a=213  __  43a=129  __  a=3


substituting  __  p=(3)+3  __  p=6