Mom bought 9 thermos bottles for 350 yuan, and the salesperson returned 35 yuan, how much is each thermos bottle.
妈妈用350元买了9个热水瓶，营业员找回35元，每个热水瓶多少元．
<gadget id="calculator">350 - 35</gadget>
<output>315</output>

<gadget id="calculator">315 / 9</gadget>
<output>35</output>

<result>35</result>