The school conducts a calligraphy competition, with a number of first, second and third prizes. The result of the competition is: the number of winners of the first and second prizes accounts for 1/4 of the total number of winners, and the number of winners of the first and third prizes accounts for the total number of winners. (4/5) of the number of people, what percentage of the total number of people won the first prize?
学校进行书法竞赛，设一，二，三等奖若干名，竞赛结果为：获一，二等奖的人数占获奖总人数的(1/4)，获一，三等奖的人数占获奖总人数的(4/5)，获一等奖的人数占总人数的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</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">(1/4) + (-1/5)</gadget>
<output>1/20 = around 0.05</output>

<result>1/20 = around 0.05</result>