(1/4) of 20 meters is exactly ((())/(())) of 6 meters; (5/6) of a number is 45, what is its (7/9).
20米的(1/4)正好是6米的((())/(()))；一个数的(5/6)是45，它的(7/9)是多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 6</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">20 * (1/24)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">45 / (5/6)</gadget>
<output>54</output>

<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">54 * (7/9)</gadget>
<output>42</output>

<result>42</result>