(5/6) of a number is (2/3), find the number, what is the formula.
一个数的(5/6)是(2/3)，求这个数，列式为多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">(2/3) / (5/6)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>