There are 1,200 popular science books in the library, which is 1/7 more than children's literature. How many children's literature books are there?
图书室有科普类图书1200本，比儿童文学类多(1/7)，儿童文学类图书有多少本？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 + (1/7)</gadget>
<output>8/7 = around 1.142857</output>

<gadget id="calculator">1_200 / (8/7)</gadget>
<output>1_050</output>

<result>1_050</result>