There are 15 tons of steel in the warehouse. 20% of the total is used for the first time, and the rest (3/5) is used for the second time. How many tons of steel are left?
仓库里有15吨钢材．第一次用去总数的20%，第二次用去剩下的(3/5)，还剩多少吨钢材？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(4/5) * (2/5)</gadget>
<output>8/25 = around 0.32</output>

<gadget id="calculator">150 * (8/25)</gadget>
<output>48</output>

<result>48</result>