20 meters (4/5) is as long as how many meters (4/7).
20米的(4/5)与多少米的(4/7)一样长．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(4/5) / (4/7)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">20 * (7/5)</gadget>
<output>28</output>

<result>28</result>