The school held a mathematics competition in the fifth grade. Those who won the first and second prizes accounted for (3/5) of the total number of winners, those who won the second and third prizes accounted for (7/10) of the total number of winners, and those who won the second prize accounted for What percentage of the total population?
学校五年级举行数学竞赛，获一、二等奖的占获奖总人数的(3/5)，获二、三等奖的占获奖总人数的(7/10)，获二等奖的占获奖总人数的几分之几？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(3/5) + (7/10)</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">(13/10) - 1</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>