The big cars in the parking lot belong to small cars (3/4), the motorcycles belong to small cars (4/5), there are 15 big cars, how many motorcycles are there?
停车场大汽车是小汽车的(3/4)，摩托车是小汽车的(4/5)，大汽车有15辆，摩托车有多少辆？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">15 / (3/4)</gadget>
<output>20</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 * (4/5)</gadget>
<output>16</output>

<result>16</result>