The fruit shop brings 5 baskets of apples, each 50 kilograms. After selling some, there are 42 kilograms left. How many kilograms of apples are sold? (List the equations of Χ that contain unknowns, and then solve them)
水果店运来5筐苹果，每筐50千克，卖出一些后，还剩下42千克，卖出了多少千克苹果？(列出含有未知数的Χ的等式，再解答)
<gadget id="calculator">50 * 5</gadget>
<output>250</output>

<gadget id="calculator">250 - 42</gadget>
<output>208</output>

<result>208</result>