Five tractors cultivate 12,000 mu of land in 24 days. How many more tractors are needed to plow 54,000 mu in 18 days?
拖拉机5台24天耕地12000亩，问18天耕完54000亩，需增加拖拉机多少台？
<gadget id="calculator">12_000 / 5 / 24</gadget>
<output>100</output>

<gadget id="calculator">100 * 18</gadget>
<output>1_800</output>

<gadget id="calculator">54_000 / 1_800</gadget>
<output>30</output>

<gadget id="calculator">30 - 5</gadget>
<output>25</output>

<result>25</result>