Originally 20 tons of goods, 9.75 tons were transported in the morning, how many tons more in the afternoon than in the morning to be transported?
原有20吨货物，上午运走9.75吨，下午要比上午多运多少吨才能运完？
<gadget id="calculator">20 - 9.75 - 9.75</gadget>
<output>0.5</output>

<result>0.5</result>