truck weighs 2 tons and can hold up to 8 tons of goods. Now that 5 tons of goods have been loaded, how many tons can be loaded?
一辆载重汽车自重2吨，最多能装8吨货物．现在已经装上5吨货物，还能装几吨？
<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<result>3</result>