A, B, and C go to the movies. If A brings money to buy three movie tickets, the difference is 0.55 yuan. If B brings money to buy three movie tickets, the difference is 0.69 yuan. If you bring the money to buy three movie tickets, it will be 0.30 yuan more. Knowing that C brings 0.37 yuan, how much does it cost to buy a movie ticket.
甲，乙，丙三人去看电影，如果甲带的钱去买三张电影票，还差0.55元，如果用乙带的钱去买三张电影票，还差0.69元，如果用三人带的钱去买三张电影标，就多0.30元，已知丙带0.37元，买一张电影票要用多少元．
<gadget id="calculator">0.3 - 0.37</gadget>
<output>-0.07</output>

<gadget id="calculator">0.55 + 0.69 + (-0.07)</gadget>
<output>1.17</output>

<gadget id="calculator">3 - 3</gadget>
<output>0</output>

<gadget id="calculator">3 + 0</gadget>
<output>3</output>

<gadget id="calculator">1.17 / 3</gadget>
<output>0.39</output>

<result>0.39</result>