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Question 1094516: A 5-gallon can of paint costs $15.50 while a 7-gallon can costs $17.00. How much is saved in the purchase of 45 gallons by buying the larger cans??
Answer by greenestamps(13209)   (Show Source):
You can put this solution on YOUR website!
The required 45 gallons is a multiple of 5 but not of 7; so if you buy 5 gallon cans you can buy exactly the amount you need, but if you buy 7 gallon cans then you will need to buy more than you need.
9 5-gallon cans makes the required 45 gallons. To get 45 gallons with 7-gallon cans, you will need to buy 7 cans, giving you 49 gallons. So you will have paint left over; however, you still spend less buying 7 7-gallon cans for $17 each than you would by buying 9 5-gallon cans for $15.50 each.
I will assume you can figure out exactly how much you will save...
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