The product of a number and (5/6) is the reciprocal of (3/5). What is this number?
一个数与(5/6)的乘积是(3/5)的倒数，这个数是多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">1 / (3/5) / (5/6)</gadget>
<output>2</output>

<result>2</result>