There are 5 tons of coal in a pile, (2/3) of it is transported away on the first day, and (2/5) tons are transported away on the second day, how many tons are left at this time?
一堆煤有5吨，第一天运走了它的(2/3)，第二天又运走了(2/5)吨，这时还剩下多少吨？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">5 * (1/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(5/3) - (2/5)</gadget>
<output>19/15 = around 1.266667</output>

<result>19/15 = around 1.266667</result>