There is a batch of cement in the warehouse of the cement factory. For the first time, 40% of the total amount is transported away, and (1/2) of the total amount is transported away for the second time. There are still 100 tons left. How many tons of cement are there in the warehouse?
水泥厂仓库有一批水泥，第一次运走总数的40%，第二次运走总数的(1/2)，还剩下100吨，仓库原有水泥多少吨？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(2/5) + (1/2)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">100 / (1/10)</gadget>
<output>1_000</output>

<result>1_000</result>