There are 5,600 classics in the library, 700 less than three times the number of popular science books. How many popular science books are there in the library?
图书室有经典名著5600本，比科普类读书本数的3倍少700本，图书室里科普读物图书多少本？
<gadget id="calculator">5_600 + 700</gadget>
<output>6_300</output>

<gadget id="calculator">6_300 / 3</gadget>
<output>2_100</output>

<result>2_100</result>