A ticket for a football game is 15 yuan. After the price reduction, the audience increases (1/3), and the income increases (1/5), so how much is the price of a ticket reduced?
足球赛门票15元一张，降价后观众增加(1/3)，收入增加了(1/5)，那么一张门票降价多少元．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(6/5) / (4/3)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">15 * (9/10)</gadget>
<output>27/2 = around 13.5</output>

<gadget id="calculator">15 - (27/2)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>