What is the difference between the largest fraction and the smallest fraction in the simplest true fraction that is greater than (1/2), smaller than (4/5), and the denominator is 60.
比(1/2)大，比(4/5)小，且分母为60的最简真分数中最大分数与最小分数之差是多少．
<gadget id="calculator">47 / 60</gadget>
<output>47/60 = around 0.783333</output>

<gadget id="calculator">31 / 60</gadget>
<output>31/60 = around 0.516667</output>

<gadget id="calculator">(47/60) - (31/60)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>