There are 560 students in the sixth grade, among them, the number who can play table tennis accounts for (3/8), and the number who can play the harmonica is the number who can play table tennis (1/7). How many people can play the harmonica?
六年级有学生560人，其中会打乒乓球的人数占了其中的(3/8)，会吹口琴的人数是会打乒乓球的人数的(1/7)，有多少人会吹口琴？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">560 * (3/8) * (1/7)</gadget>
<output>30</output>

<result>30</result>