Add 3 to 2 times a number, multiply by 3, and divide by 3 to get (1/3). What is the number?
一个数的2倍加上3，再乘以3，再除3得(1/3)，这个数是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">3 - 3</gadget>
<output>0</output>

<gadget id="calculator">0 / 2</gadget>
<output>0</output>

<result>0</result>