The fruit shop shipped 9 boxes of apples and 9 pears, each box of apples weighed 20 kg, and each box of pears weighed 15 kg. How many kilograms more apples than pears are shipped?
水果店运来苹果、梨各9箱，苹果每箱20千克，梨每箱15千克．运来苹果比梨多多少千克？
<gadget id="calculator">20 - 15</gadget>
<output>5</output>

<gadget id="calculator">5 * 9</gadget>
<output>45</output>

<result>45</result>