certain elementary school originally had volleyballs (5/8) of the total number of basketballs and volleyballs, and later bought 24 basketballs. At this time, the number of volleyballs accounted for (5/12) the total number of the two kinds of balls. How many volleyballs are there?
某小学原来排球个数是篮球、排球总个数的(5/8)，后来又买进24个篮球，这时排球个数占两种球总数的(5/12)，排球有多少个？
<gadget id="calculator">12 - 5</gadget>
<output>7</output>

<gadget id="calculator">7 / 5</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(7/5) - (3/5)</gadget>
<output>4/5 = around 0.8</output>

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

<result>30</result>