20 (4/5) is equal to how many (8/13).
20的(4/5)和多少的(8/13)相等．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">8 / 13</gadget>
<output>8/13 = around 0.615385</output>

<gadget id="calculator">(4/5) / (8/13)</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">20 * (13/10)</gadget>
<output>26</output>

<result>26</result>