The Mid-Autumn Festival is here, Dad bought back 108 yuan of moon cakes, and mother bought back 4.5 kilograms of durians, which cost 4.5 yuan less than Dad’s. How much is a kilogram of durians?
中秋节到了，爸爸买回108元的月饼，妈妈买回4.5千克榴莲，比爸爸少花4.5元钱，每千克榴莲多少元？
<gadget id="calculator">108 - 4.5</gadget>
<output>103.5</output>

<gadget id="calculator">103.5 / 4.5</gadget>
<output>23</output>

<result>23</result>