When Class 5 and 1 conducted statistics, they found that each person in the class liked at least one of the two activities of skipping rope and playing table tennis. There are (3/5) students in the class who like to skip rope, and (4/7) students like to play table tennis. What percentage of the class likes both?
五1班进行统计时发现，跳绳、打乒乓球这两项活动，全班每人至少喜欢一种．全班有(3/5)的同学喜欢跳绳，有(4/7)的同学喜欢打乒乓球，两样都喜欢的占全班的几分之几？
<gadget id="calculator">3 / 5</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>

<result>6/35 = around 0.171429</result>