The numerator of a fraction is 15, 20, 30, the greatest common divisor of these three numbers, and the denominator is the smallest multiple of these three numbers. What is the simplest fraction of this fraction?
一个分数的分子是15、20、30、这三个数的最大公约数，而分母是这三个数的最小倍数，这个分数约成最简分数是多少．
<gadget id="calculator">2 * 2 * 3 * 5</gadget>
<output>60</output>

<gadget id="calculator">5 / 60</gadget>
<output>1/12 = around 0.083333</output>

<result>1/12 = around 0.083333</result>