There is a pile of apples, and after taking away (2/3) there are still 9 apples left. How many apples are there in this pile?
有一堆苹果，取走它的(2/3)之后还剩9个，这堆苹果原来有多少个？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">9 / (1/3)</gadget>
<output>27</output>

<result>27</result>