The cafeteria used exactly 2 bottles of peanut oil in 7 days, a total of 6 kg. How many kilograms of peanut oil is used on average per day?
食堂7天正好用去2瓶花生油，共6千克．平均每天用花生油多少千克？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<result>6/7 = around 0.857143</result>