batch of 36 tons of steel was shipped from the warehouse. 25% of it was used for the first time, and 15 tons were used for the second time. How many tons are left?
仓库运来一批钢材36吨，第一次用去它的25%，第二次用去15吨，还剩多少吨？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">36 * (1/4)</gadget>
<output>9</output>

<gadget id="calculator">36 - 9 - 15</gadget>
<output>12</output>

<result>12</result>