There is a pile of sand used as a building weighing 21 tons. First, 18 tons are transported by truck, and then transported by a small cart with a load of 50 kg. How many times can it be transported?
有一堆做楼房用的沙约重21吨，先用卡车运走了18吨，再用一辆载重50千克的小推车来运，多少次才能运完？
<gadget id="calculator">21 - 18</gadget>
<output>3</output>

<gadget id="calculator">1_000 / 50</gadget>
<output>20</output>

<gadget id="calculator">3 * 20</gadget>
<output>60</output>

<result>60</result>