Xiaoli buys 5 kilograms of watermelon for 9.5 yuan, and 3 kilograms of pineapples for 15.6 yuan. Which fruit is more expensive? How expensive is it?
小丽用9.5元买5千克西瓜，用15.6元买3千克菠萝，哪种水果比较贵？贵多少？
<gadget id="calculator">15.6 / 3</gadget>
<output>5.2</output>

<gadget id="calculator">9.5 / 5</gadget>
<output>1.9</output>

<gadget id="calculator">5.2 - 1.9</gadget>
<output>3.3</output>

<result>3.3</result>