Xinhua Bookstore shipped in a batch of science and technology books, sold 40% of the total in the first week, sold 160 copies in the second week, and left 116 books. How many copies of this batch of science and technology books are there?
新华书店运进一批科技书，第一周售出总数的40%，第二周售出160本，剩116本，这批科技书共有多少本？
<gadget id="calculator">160 + 116</gadget>
<output>276</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">276 / (3/5)</gadget>
<output>460</output>

<result>460</result>