(2/5) of a number is 12, what is the reciprocal (5/6) of this number?
一个数的(2/5)是12，这个数倒数的(5/6)是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">12 / (2/5)</gadget>
<output>30</output>

<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(1/30) * (5/6)</gadget>
<output>1/36 = around 0.027778</output>

<result>1/36 = around 0.027778</result>