Put 3 teapots on the left side of the balance and 9 water cups on the right side, the balance is balanced. 1 teapot weighs the same as how many drinking cups.
天平左边放3个茶壶，右边放9个水杯，天平平衡．1个茶壶和多少个水杯同样重．
<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<result>3</result>