(5/6) of a number is equal to 20% of 18, find this number. (solution by equation)
一个数的(5/6)等于18的20%，求这个数．(用方程解)
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">18 * (1/5)</gadget>
<output>18/5 = around 3.6</output>

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

<gadget id="calculator">(18/5) / (5/6)</gadget>
<output>108/25 = around 4.32</output>

<result>108/25 = around 4.32</result>