The worker planted 25 trees a day, and it took 40 days to complete the planting. The actual number was 15 more than the original plan. How many days did the planting take?
工人种树，计划每天种25棵，40天完成，实际每天比原计划多种15棵，实际多少天种完？
<gadget id="calculator">25 * 40</gadget>
<output>1_000</output>

<gadget id="calculator">25 + 15</gadget>
<output>40</output>

<gadget id="calculator">1_000 / 40</gadget>
<output>25</output>

<result>25</result>