8 cars save a total of 390 kilograms of gasoline in 15 days. How many kilograms of gasoline are saved per car per day on average?
8辆汽车15天共节约汽油390千克，平均每辆汽车每天节约汽油多少千克？
<gadget id="calculator">390 / 8 / 15</gadget>
<output>13/4 = around 3.25</output>

<result>13/4 = around 3.25</result>