Dongdong and Xiaoming go to the movies. The price of a movie ticket is Dongdong's money (6/25), and Mingming's money (3/5). After the two bought one each, the money left by Dongdong was 30 yuan more than that left by Mingming. How much money do you have before buying movie tickets?
东东和小明去看电影，一张电影票的价钱是东东所有钱的(6/25)，是明明所有钱的(3/5)．两人各买了一张后，东东剩的钱比明明剩的钱多30元．明明买电影票前有多少元？
<gadget id="calculator">6 / 25</gadget>
<output>6/25 = around 0.24</output>

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

<gadget id="calculator">30 * (6/25) * (3/5)</gadget>
<output>108/25 = around 4.32</output>

<gadget id="calculator">(3/5) - (6/25)</gadget>
<output>9/25 = around 0.36</output>

<gadget id="calculator">(108/25) / (9/25) / (3/5)</gadget>
<output>20</output>

<result>20</result>