1.2 times 15 is 2 less than (2/3) of a number, what is this number?
15的1.2倍比一个数的(2/3)少2，这个数是多少？
<gadget id="calculator">15 * 1.2</gadget>
<output>18</output>

<gadget id="calculator">2 + 18</gadget>
<output>20</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">20 / (2/3)</gadget>
<output>30</output>

<result>30</result>