If 9 apples are exchanged for 3 large watermelons, and 6 oranges can be exchanged for 2 apples, then how many oranges can be exchanged for 6 large watermelons?
9个苹果换3个大西瓜，6个橘子可以换2个苹果，那么6个大西瓜可以换多少个橘子．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">6 * 3 * 3</gadget>
<output>54</output>

<result>54</result>