There are 10 tons of steel in the warehouse. 20% of the total is used for the first time, and (3/4) tons are used for the second time. How many tons of steel are left?
仓库里有10吨钢材．第一次用去总数的20%，第二次用去(3/4)吨．还剩下多少吨钢材？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">10 * (4/5)</gadget>
<output>8</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">8 - (3/4)</gadget>
<output>29/4 = around 7.25</output>

<result>29/4 = around 7.25</result>