Mom bought 3 kilograms of pineapples, paid the salesperson 50 yuan, and got back 34.4 yuan. How much is a kilogram of pineapple?
妈妈买了3千克菠萝，付给售货员50元，找回了34.4元．每千克菠萝多少元？
<gadget id="calculator">50 - 34.4</gadget>
<output>15.6</output>

<gadget id="calculator">15.6 / 3</gadget>
<output>5.2</output>

<result>5.2</result>