Xiao Ming and his three good friends went to the Children's Paradise to play. If each ticket is 30 yuan, how much will they spend in total to buy tickets.
小明和他的3个好朋友去儿童乐园游玩．如果每张门票30元，他们一共要用多少元买门票．
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">4 * 30</gadget>
<output>120</output>

<result>120</result>