The number A (5/12) is equal to 30% of the number B, and the number A is the number B.
甲数的(5/12)等于乙数的30%，甲数是乙数的多少．
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / (3/10)</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">1 / (5/12) / (10/3)</gadget>
<output>18/25 = around 0.72</output>

<result>18/25 = around 0.72</result>