Yimin Shoe Factory actually produced 1,200 pairs of women's sandals in 20 days, and actually produced 10 pairs more than planned every day. How many days were originally planned to produce these sandals?
益民制鞋厂实际用20天制作1200双女式凉鞋，实际每天比计划多制作10双，原计划多少天制作出这些凉鞋？
<gadget id="calculator">1_200 / 20</gadget>
<output>60</output>

<gadget id="calculator">60 - 10</gadget>
<output>50</output>

<gadget id="calculator">1_200 / 50</gadget>
<output>24</output>

<result>24</result>