Xinhua Bookstore sold a total of 751 books in three days, 234 were sold on the first day, 116 were sold on the second day, and how many were sold on the third day?
新华书店三天共销售图书751本，第一天售出234本，第二天售出116本，第三天售出多少本？
<gadget id="calculator">234 + 116</gadget>
<output>350</output>

<gadget id="calculator">751 - 350</gadget>
<output>401</output>

<result>401</result>