The entrance ticket of the gymnasium is 3 yuan a piece. After the price is reduced, the audience increases by half and the income increases (1/4). So how much is the price of each admission ticket reduced?
体育馆入场卷3元一张，降价后观众增加一半，收入增加了(1/4)，那么每张入场卷降价多少？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(5/4) / (3/2)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">3 * (1/6)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>