Store promotion, every 3 empty soda bottles can be exchanged for a bottle of soda. Xiao Ming bought 18 bottles of soda, how many bottles of soda can he drink in total?
商店促销活动，每3个空汽水瓶可以换一瓶汽水．小明家买了18瓶汽水，一共可以喝到多少瓶汽水．
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">18 + 9</gadget>
<output>27</output>

<result>27</result>