C=Candy Bar(s)
D=Drink(s)
--------------------
60C+110D=265
120C+90D=270
-------------------
Therefore:
60C=265-110D
Therefore:
2(60C)+90D=270
2(265-110D)+90D=270
530-220D+90D=270
530-270=220D-90D
260=130D
D=260/130
D=2
-------------------
If D=2,
60C=265-110(2)
60C=265-220
60C=45
C=45/60
C=3/4
C=0.75
---------------------
*Candy bars sell for $0.75 whilst drinks sell for $2.00.