There are 544 poplars, 35 are planted every day on average, and 19 are left in the end. How many days have you planted in total?
有544棵杨数，平均每天栽35棵，最后还剩19棵，一共栽了多少天？
<gadget id="calculator">544 - 19</gadget>
<output>525</output>

<gadget id="calculator">525 / 35</gadget>
<output>15</output>

<result>15</result>