The ratio of the sum of 40% of a number and 3.6 to 15 is (2/3), find this number.
一个数的40%与3.6的和与15的比值是(2/3)，求这个数．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">15 * (2/3)</gadget>
<output>10</output>

<gadget id="calculator">10 - 3.6</gadget>
<output>6.4</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">6.4 / (2/5)</gadget>
<output>16</output>

<result>16</result>