A minimal fraction, its numerator is reduced to the original (1/3), and the denominator is expanded by 3 times to get (1/4), what is the simplest fraction?
一个最简分数，把它的分子缩小到原来的(1/3)，分母扩大3倍后得到(1/4)，这个最简分数是多少．
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

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

<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">3 / (4/3)</gadget>
<output>9/4 = around 2.25</output>

<result>9/4 = around 2.25</result>