There are 50 kilograms of fruit in the store, and after selling 30.5 kilograms, another 20.5 kilograms are shipped in. How many kilograms of fruit are there in the store at this time?
商店里有水果50千克，卖出30.5千克后，又运进了20.5千克，这时商店里有水果多少千克？
<gadget id="calculator">50 - 30.5</gadget>
<output>19.5</output>

<gadget id="calculator">19.5 + 20.5</gadget>
<output>40</output>

<result>40</result>