There are two kinds of yachts in the park, big and small. The number of people sitting in two large boats is equal to the number of people sitting in three small boats. It is known that 5 large and 6 small boats seat a total of 81 tourists. How many more people do each large yacht have than the small one?
公园有大、小两种游艇，2条大艇坐的人数和3条小艇坐的人数相等．已知5条大和6条小艇共坐81名游客，每条大游艇比小游艇多坐几人？
<gadget id="calculator">81 / 9</gadget>
<output>9</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">9 * (2/3)</gadget>
<output>6</output>

<gadget id="calculator">9 - 6</gadget>
<output>3</output>

<result>3</result>