When several children play games together, there are 2 more groups of 3 than 4. How many are these children?
若干小朋友一起做游戏，3人分成一组比4人分成一组时要多出2组．这些小朋友共有多少人．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/3) - (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">2 / (1/12)</gadget>
<output>24</output>

<result>24</result>