How many tons is (2/5) of (5/4) tons?
(5/4)吨的(2/5)是多少吨．
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

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

<gadget id="calculator">(5/4) * (2/5)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>