There are 600 copies of a new book in Xinhua Bookstore, 148 were sold in the morning and 252 in the afternoon, how many copies are left?
新华书店的一种新书有600本，上午卖出148本，下午卖出252本，还剩下多少本？
<gadget id="calculator">148 + 252</gadget>
<output>400</output>

<gadget id="calculator">600 - 400</gadget>
<output>200</output>

<result>200</result>