If (3/5) meters are used up for a piece of iron wire, (1/4) meters are left over, how many meters is left over?
一根铁丝用去(3/5)米，剩下的比用去的多(1/4)米，剩下的长多少米．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/5) + (1/4)</gadget>
<output>17/20 = around 0.85</output>

<result>17/20 = around 0.85</result>