How much is (4/5) of (5/14) tons?
(5/14)吨的(4/5)是多少．
<gadget id="calculator">5 / 14</gadget>
<output>5/14 = around 0.357143</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(5/14) * (4/5)</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>