There are 9 baskets of apples in the orchard, each weighing 30 kilograms, and some pears. A car can only hold up to 320 kilograms of fruit at a time. After loading all the apples, how many kilograms of pears can it hold at most?
果园里有9筐苹果，每筐30千克，还有一些梨，一辆汽车一次最多只能装320千克水果，装完全部苹果后，最多只能装多少千克梨？
<gadget id="calculator">30 * 9</gadget>
<output>270</output>

<gadget id="calculator">320 - 270</gadget>
<output>50</output>

<result>50</result>