# arithmetic

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If i currently have 12 bottles of water on my shelf, and want to keep a minimum level of 6 bottles at all times. I have an average sale 2 per day. What is the minimum number i would order for enough bottles for 7 days?

thanks.

• arithmetic -

On the average, there are enough bottles for (12-6)/2=three more days. For seven days, we need 2*(7-3)=eight more bottles.

• arithmetic -

8 more bottles

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