On Children's Day, Fang Fang went to Nanhu Park with her grandfather, father, and mother. Adult tickets were 6.5 yuan each, and children's tickets were half price. How much did they spend on the tickets?
六一儿童节那天，芳芳和爷爷、爸爸、妈妈去南湖公园游玩，成人每张6.5元，儿童门票半价，他们买门票一共花多少钱？
<gadget id="calculator">6.5 * 3</gadget>
<output>19.5</output>

<gadget id="calculator">6.5 / 2</gadget>
<output>3.25</output>

<gadget id="calculator">19.5 + 3.25</gadget>
<output>22.75</output>

<result>22.75</result>