Class 61 subscribed to the "Small Number News" "Mathematics Little Smart", at least one kind per person, 60% of the class subscribed to "Small Number News", (4/7) subscribed to "Mathematical Little Smart". There are 6 people who subscribe to these two newspapers, how many people subscribe to "Small Numbers"?
六1班征订《小数报》的《数学小灵通》，每人至少一种，全班同学的60%订了《小数报》，(4/7)订了《数学小灵通》．这两种报纸都订的有6人，订《小数报》的有多少人？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(4/7) - 1</gadget>
<output>-3/7 = around -0.428571</output>

<gadget id="calculator">(3/5) + (-3/7)</gadget>
<output>6/35 = around 0.171429</output>

<gadget id="calculator">6 / (6/35)</gadget>
<output>35</output>

<gadget id="calculator">35 * (3/5)</gadget>
<output>21</output>

<result>21</result>