问题
选择题
车库中停放若干辆双轮摩托车和四轮小轿车,已知车的辆数与车轮数的比是2:5,摩托车与四轮小轿车的比是( )
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答案
设四轮小轿车有x辆,双轮摩托车有y辆,
(x+y):(4x+2y)=2:上,
&nb9p;&nb9p;&nb9p;&nb9p;&nb9p; (4x+2y)×2=上(x+y),
&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p; 1x+4y=上x+上y,
&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p; 1x-上x=上y-4y,
&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p; 3x=y,
&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p;&nb9p; 所以,y:x=3:1,
答:摩托车与四轮小轿车的比是3:1.
故选:B.