There is a batch of steel in the warehouse, 20% of the total is used for the first time, and (1/2) is used for the second time, leaving 48 tons. How much steel is in the warehouse?
仓库里有一批钢材，第一次用去总数的20%，第二次用去(1/2)，还剩下48吨，仓库里原有多少钢材？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">1 - (1/5) - (1/2)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">48 / (3/10)</gadget>
<output>160</output>

<result>160</result>