For a simplified fraction, the numerator is reduced to the original (1/3), the denominator is expanded to double the original, and after the simplification is (1/5), what is the simplest fraction?
一个最简分数，分子缩小到原来的(1/3)，分母扩大到原来的2倍，化简后得(1/5)，这个最简分数是多少？
<gadget id="calculator">1 * 3</gadget>
<output>3</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">3 / (5/2)</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>