The fruit shop shipped 9 boxes of apples and 9 boxes of bananas. The apples weighed 270 kg and the bananas weighed 180 kg.
水果店运来苹果和香蕉各9箱，苹果共重270千克，香蕉共重180千克，每箱苹果比每箱香蕉多多少千克？
<gadget id="calculator">270 - 180</gadget>
<output>90</output>

<gadget id="calculator">90 * 9</gadget>
<output>810</output>

<result>810</result>