Xiaoling goes to the park with her grandfather, grandma, father, and mother. Tickets are 3.5 yuan for adults and 1.5 yuan for children. How much does Xiaoling's family need to buy tickets?
小玲和爷爷、奶奶、爸爸、妈妈一家去逛公园，成人票每张3.5元，儿童票每张1.5元，小玲一家买门票一共需要多少钱？
<gadget id="calculator">3.5 * 4</gadget>
<output>14</output>

<gadget id="calculator">14 + 1.5</gadget>
<output>15.5</output>

<result>15.5</result>