Xinhua Bookstore has 1,600 children's books, 400 were sold on the first day, and the remaining 25% were sold on the second day. How many books were sold on the second day?
新华书店有1600本儿童读物，第一天售出400本，第二天售出余下的25%，第二天售出多少本？
<gadget id="calculator">1_600 - 400</gadget>
<output>1_200</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1_200 * (1/4)</gadget>
<output>300</output>

<result>300</result>