The construction team has a batch of cement, and when 30% of this batch of cement is used up, there are 560 tons left. How many tons of this batch of cement was used?
施工队有一批水泥，当用去这批水泥的30%后，还剩560吨．这批水泥用去了多少吨？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">560 / (7/10)</gadget>
<output>800</output>

<gadget id="calculator">800 - 560</gadget>
<output>240</output>

<result>240</result>