Question 374067
(8.50-2.15)x-5*3.75=120
6.35x-18.75=120
6.35x=120+18.75
6.35x=138.75
x=138.75/6.35
x=21.85 hours.
Proof:
(8.50-2.15)*21.85-5*3.75=120
6.35*21.85-18.75=120
138.75-18.75=120
120=120