There are 6 tons of steel pipes in the warehouse, the first engineering team took 30% of the total, and the second engineering team took (1/2) tons, how many tons of steel pipes are left?
仓库里有6吨钢管，第一工程队领去总数的30%，第二工程队领去(1/2)吨，还剩钢管多少吨？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">6 * (3/10)</gadget>
<output>9/5 = around 1.8</output>

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

<gadget id="calculator">6 - (9/5) - (1/2)</gadget>
<output>37/10 = around 3.7</output>

<result>37/10 = around 3.7</result>