The school holds a painting competition, with a number of first, second and third prizes. The first and second prizes account for 5/8 of the total number of winners, the second and third prizes account for 4/5 of the total number of winners, and the second and third prizes account for 4/5 of the total number of winners. What percentage of the number of winners are those who are waiting for the prize?
学校举行绘画比赛，设一二三等奖若干名，获一二等奖的占获奖总人数的(5/8)，获二三等奖的占获奖总人数的(4/5)，获二等奖的占获奖人数的几分之几？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) - 1</gadget>
<output>-1/5 = around -0.2</output>

<gadget id="calculator">(5/8) + (-1/5)</gadget>
<output>17/40 = around 0.425</output>

<result>17/40 = around 0.425</result>