Jianjun Road Primary School has piano and violin classes, and the students in these two classes are from Class A or Class B. (1/3) of the piano class is from class A, and (3/7) of the violin class is from class B, and the total number of the piano class is (9/7) times the total number of the violin class, then the two interest classes What is the ratio of the number of people from class B to the total number of people.
建军路小学有钢琴，小提琴这两个兴趣班，这两个班的学员都是来自A班或者B班的．钢琴班有(1/3)来自A班，小提琴班有(3/7)来自B班，并且钢琴班的总人数是小提琴班总人数的(9/7)倍，那么这两个兴趣班中来自B班的人数与总人数的比值是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">9 * (2/3)</gadget>
<output>6</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">7 * (3/7)</gadget>
<output>3</output>

<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<gadget id="calculator">9 + 7</gadget>
<output>16</output>

<gadget id="calculator">9 / 16</gadget>
<output>9/16 = around 0.5625</output>

<result>9/16 = around 0.5625</result>