There is a batch of cement on the construction site, which was transported away on the first day (2/5), and 35% of it was transported away on the second day, leaving 25 tons. How many tons of this batch of cement are there?
工地有一批水泥，第一天运走(2/5)，第二天运走35%，还剩下25吨，这批水泥有多少吨？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 - (2/5) - (7/20)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">25 / (1/4)</gadget>
<output>100</output>

<result>100</result>