Aunt Wang bought 11 thermos bottles, paid 200 yuan, and got back 35 yuan. How much is each thermos bottle?
王阿姨买11个暖瓶，付了200元，找回35元，每个暖瓶多少元？
<gadget id="calculator">200 - 35</gadget>
<output>165</output>

<gadget id="calculator">165 / 11</gadget>
<output>15</output>

<result>15</result>