A dealer owns a group of station wagons and motorcycles. If the number of tires (excluding spare tires) on the vehicles is 30 more than twice the number of vehicles, then the number of station wagons the dealer owns is Choose the correct choice from the following:
A) 10
B) 15
C) 20
D) 30
E) 45
Assume X station wagons, Y motorcycles   Framing the equation.   2(X+Y)+30 = 4X + 2Y   =&gt; X = 15   ANSWER:15
<result>B</result>
A dealer owns a group of station wagons and motorcycles. If the number of tires (excluding spare tires) on the vehicles is 30 more than twice the number of vehicles, then the number of station wagons the dealer owns is