Question

you currently have 12 bottles of water on your shelf you want to keep a minimum level of 6 at all times you average two bottles per day what is the minimum number you should order enough bottles for 7 days

Answer 1

14-6 = 8. You need to order 8 bottles.

12+8 = 20 bottles total
Bottles at End of day Day Bottles
0 20
1 18
2 16
3 14
4 12
5 10
6 8
7 6