Question 1091816
V=Van, B=Bus
2V+12B=520
13V+3B=230
multiply second by -4 and add the two.
-52V-12B=-920
-50V=-400
V=8
substitute into first, where 16+12B=520; 12B=504, and B=42
check in second where 13(8)+3(42)=230
van  8 
bus 42