Xiaoqiang's family went to the park to play, and the ticket gate indicated that each adult ticket was 2.5 yuan and each child ticket was 1.5 yuan. Xiaoqiang's family, how much does it cost to buy tickets?
小强一家去公园玩，售票口注明成人票每张2.5元，儿童票每张1.5元．小强一家，买门票一共要花多少钱？
<gadget id="calculator">2.5 * 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 1.5</gadget>
<output>6.5</output>

<result>6.5</result>