The pricing method of a taxi in a certain city is that the starting price is 7 yuan (within 3 kilometers), and the average fare is 1.5 yuan per kilometer for 3 kilometers. Xiao Wang takes a taxi from his home to the park for a total of 19 kilometers. how much?
某市出租车计价方法是起步价为7元(3千米以内)，3千米以外按平均每千米1.5元计费，小王乘出租车从家到公园一共有19千米，至少需要多少元？
<gadget id="calculator">19 - 3</gadget>
<output>16</output>

<gadget id="calculator">1.5 * 16</gadget>
<output>24</output>

<gadget id="calculator">7 + 24</gadget>
<output>31</output>

<result>31</result>