The number of boys in the mathematics interest group in the school used to be 4/7, but 6 boys joined in later, so boys accounted for 5/8 of the mathematics interest group. How many boys are there in the mathematics interest group now?
学校数学兴趣小组原来男生人数占(4/7)，后来又有6名男生参加进来，这样男生就占数学兴趣小组的(5/8)．现在数学兴趣小组有男生多少人？
<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(5/3) - (4/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">6 / (1/3)</gadget>
<output>18</output>

<gadget id="calculator">18 * (5/3)</gadget>
<output>30</output>

<result>30</result>