The sum of the numerator and denominator of a fraction is 40, which is 0.6 after converting to a decimal. What is the fraction?
一个分数的分子和分母的和是40，化成小数后是0.6，这个分数是多少．
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">40 * (5/8)</gadget>
<output>25</output>

<gadget id="calculator">(3/8) / 25</gadget>
<output>3/200 = around 0.015</output>

<gadget id="calculator">40 * (3/200)</gadget>
<output>3/5 = around 0.6</output>

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