Each student in Class 5 and 2 subscribed to at least one magazine, among which the number of people who subscribed to "Fun Mathematics" accounted for (3/5) of the whole class, and the number of people who subscribed to "Juvenile Expo" accounted for (3/4) of the whole class. What percentage of the class is the number of people who subscribe to both?
五2班同学每人至少订了一种杂志，其中订阅《趣味数学》的人数占全班人数的(3/5)，订阅《少年博览》的人数占全班人数的(3/4)，两种都订阅的人数占全班人数的几分之几？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) - 1</gadget>
<output>-1/4 = around -0.25</output>

<gadget id="calculator">(3/5) + (-1/4)</gadget>
<output>7/20 = around 0.35</output>

<result>7/20 = around 0.35</result>