Question 963330

V=number of vans; B=number of buses
V+B=13
V=13-B Use this to substitute for V.
9V+15B=147 Substitute for V from above.
9(13-B)+15B=147
117-9B+15B=147 Subtract 117 from each side.
6B=30 Divide each side by 6
B=5 ANSWER 1: There were 5 buses.
V=13-B=13-5=8 ANSWER 2: There were 8 vans.
CHECK:
9V+15B=147
9(8)+15(5)=147
72+75=147
147=147