In the meteorological team of the sixth grade, girls accounted for the total number (8/15). Later, 3 boys signed up to join the meteorological team, so that girls accounted for the total number (4/9). How many boys are there in this group?
六年级气象小组中，女生占总人数的(8/15)，后来又有3名男生报名参加了气象小组，这样女生占总人数的(4/9)．这个小组现有几名男生？
<gadget id="calculator">9 / 4</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">15 / 8</gadget>
<output>15/8 = around 1.875</output>

<gadget id="calculator">(9/4) - (15/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">3 / (3/8) / (4/9)</gadget>
<output>18</output>

<gadget id="calculator">1 - (4/9)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">18 * (5/9)</gadget>
<output>10</output>

<result>10</result>