Mom bought 4 water bottles, gave the salesperson 50 yuan, and got 2 yuan back. How much is each water bottle?
妈妈买了4个开水瓶，给营业员50元钱，找回了2元，每个开水瓶多少元？
<gadget id="calculator">50 - 2</gadget>
<output>48</output>

<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<result>12</result>