Put 18 kilograms of vegetable oil in 5 bottles of the same size, each bottle can hold 3.5 kilograms of vegetable oil, how many kilograms of vegetable oil are left without bottles.
把18千克菜油装在5个大小一样的瓶子里，每个瓶子可装菜油3.5千克，还剩下多少千克千克菜油没有瓶子装．
<gadget id="calculator">3.5 * 5</gadget>
<output>17.5</output>

<gadget id="calculator">18 - 17.5</gadget>
<output>0.5</output>

<result>0.5</result>