The fruit shop has brought in 52 baskets of apples, each weighing 40 kilograms, and 28 baskets have been sold. How many kilograms are left?
水果店运进52筐苹果，每筐重40千克，已经卖出28筐，还剩多少千克？
<gadget id="calculator">52 - 28</gadget>
<output>24</output>

<gadget id="calculator">24 * 40</gadget>
<output>960</output>

<result>960</result>