A movie ticket is 30 yuan a piece. After the price is reduced, the audience doubles and the income increases (1/3). How much is the price of a ticket reduced?
电影门票30元一张，降价后观众增加1倍，收入增加(1/3)，则一张门票降价多少元
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 * (1/3)</gadget>
<output>10</output>

<gadget id="calculator">30 + 10</gadget>
<output>40</output>

<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">30 - 20</gadget>
<output>10</output>

<result>10</result>