so if you use 1 part cleaner and 3 parts water for 1 day and each case holds 1 gallon of cleaner then you need 1 case for each day so for 7 days you would need 7 cases
You need to order 7 cases of window cleaner to have enough for 7 days of cleaning. Each case holds 1 gallon, and you will use 1 gallon per day. Therefore, 7 gallons are needed for 7 days, which equals 7 cases.
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