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

<gadget id="calculator">3 * 1</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>