pile of yellow sand is 7.2 tons, the weight ratio of the first transported away (1/5), and the second transported away to the first time is 2:5. How many tons of yellow sand were transported away for the second time?
一堆黄沙7.2吨，第一次运走它的(1/5)，第二次运走的与第一次的重量比是2：5．第二次运走黄沙多少吨？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">7.2 * (1/5)</gadget>
<output>1.44</output>

<gadget id="calculator">2 * 1.44</gadget>
<output>2.88</output>

<gadget id="calculator">2.88 / 5</gadget>
<output>0.576</output>

<result>0.576</result>