A printing factory planned to print 20,000 textbooks in March, but it printed 7,000 textbooks in the first half of the year. At this speed, how many more textbooks can it print in March?
某印刷厂计划三月份印刷课本20000本，结果上旬就印刷7000本，照这样速度，三月份可以多印刷多少本？
<gadget id="calculator">7_000 / 10</gadget>
<output>700</output>

<gadget id="calculator">700 * 31</gadget>
<output>21_700</output>

<gadget id="calculator">21_700 - 20_000</gadget>
<output>1_700</output>

<result>1_700</result>