The school holds a competition, with first, second, and third prizes. The first and second prizes account for (2/5) of the total number of winners, and the second and third prizes account for (13/15) of the total number of awardees. , What percentage of the total number of winners are the second prizes?
学校举办一次竞赛，设一、二、三等奖若干名，获一、二等奖占获奖总人数的(2/5)，获二、三等将的占获奖总人数的(13/15)，二等奖的占获奖总人数的几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">13 / 15</gadget>
<output>13/15 = around 0.866667</output>

<gadget id="calculator">(13/15) - 1</gadget>
<output>-2/15 = around -0.133333</output>

<gadget id="calculator">(2/5) + (-2/15)</gadget>
<output>4/15 = around 0.266667</output>

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