The weight of 1 grapefruit is equivalent to the weight of 3 apples, the weight of 2 cantaloupe is equivalent to the weight of 18 apples, then the weight of one cantaloupe is equivalent to the weight of grapefruit.
1个柚子的重量相当于3个苹果的重量，2个哈密瓜的重量相当于18个苹果的重量，那么一个哈密瓜的重量相当于多少柚子的重量．
<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<result>3</result>