There are 10 tons of coal, (1/5) is used for the first time, and the rest (1/5) is used for the second time, how many tons of coal are shared between the two times?
有10吨煤，第一次用去(1/5)，第二次用去剩下的(1/5)，两次共用去多少吨煤？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 * (1/5)</gadget>
<output>2</output>

<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">8 * (1/5)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">2 + (8/5)</gadget>
<output>18/5 = around 3.6</output>

<result>18/5 = around 3.6</result>