For a simple fraction, expand its numerator to 3 times, and reduce the denominator to the original (1/3), which is equal to 3 (1/2). What was the original score.
一个最简分数，把它的分子扩大到它的3倍，分母缩小到原来的(1/3)后等于3(1/2)．原来的这个分数是多少．
<gadget id="calculator">7 / 3</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">(7/3) / 6</gadget>
<output>7/18 = around 0.388889</output>

<result>7/18 = around 0.388889</result>