The number of girls in the school chess group originally accounted for (3/7), and later 30 girls joined in, so that girls accounted for (2/3) of the total number of chess players. How many girls are there in the chess group now?
学校棋类组原来女生人数占(3/7)，后来又有30名女生参加进来，这样女生就占棋类总人数的(2/3)．现在棋类组有女生多少人？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

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

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

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(3/7) / (4/7)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2 - (3/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">30 / (5/4)</gadget>
<output>24</output>

<gadget id="calculator">24 * 2</gadget>
<output>48</output>

<result>48</result>