Grandma bought 2.4kg of bananas and paid 20 yuan, and the salesperson got back 4.4 yuan. How much is a kilogram of bananas?
奶奶买了2.4kg的香蕉，付20元，售货员找回4.4元，每千克香蕉多少元？
<gadget id="calculator">20 - 4.4</gadget>
<output>15.6</output>

<gadget id="calculator">15.6 / 2.4</gadget>
<output>6.5</output>

<result>6.5</result>