simple true fraction, the difference between the denominator and the numerator is 2, and their least common multiple is 15. What is the fraction?
一个最简真分数，分母和分子相差2，它们的最小公倍数是15，这个分数是多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>