There are 25 tons of steel in the warehouse. 20% of the total is used for the first time, and (3/5) of the total is used for the second time. How many tons of steel are left?
仓库里有25吨钢材．第一次用去总数的20%，第二次用去总数的(3/5)，还剩多少吨钢材？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (1/5) - (3/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">25 * (1/5)</gadget>
<output>5</output>

<result>5</result>