# Milk Problem

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• The Market sells a one gallon cartons of milk for \$3.09﻿. They also sell half gallon for \$1.65. I want to know how much cents I would pay for a carton with the same number of quarts
• You pay a flat fee of \$0.21 and for every quart it is \$0.72﻿
• Ok so it does go up linear of it is \$0.72 for every quart.﻿
• Well I can help! If it \$0.72 for every quart then you would mutiply 0.72 times 3. That equals 2.16. You can't forget your flat fee of 0.21 so you add 2.16 and 0.21 which equals 2.37. For that 3 gallon carton you would pay \$2.37.﻿
• If I want a 3-gallon carton how much would I pay if its \$0.72 ﻿for every quart and I have to pay a flat fee of \$0.21
• Yea I can help again. so if it cost \$3.45 then you use the same stuff from last problem. You do 3.45 minus 0.21 which equal 3.24. Then you divide 0.72 by 3.24 and that tells you how many quarts there is.﻿
• I just found a carton of milk for \$3.45. But it doesn't say how many quarts it is. Can someone help me please.﻿
• Well you would have to mutiply the price from the other store by 0.72 and then add 0.21 to your answer.﻿ So for the half of a quart 0.57 times 0.72 equals 0.41. Than add 0.21 which equals 62. Then do that with 0.99 which all that together equals 0.92.
• In the other store it cost \$0.57 for 1/2 of a quart. for one quart it cost \$0.99. I need help again﻿
• ﻿To find which one is better you need to calculate the price of the other one. So a 4 quart is 3.09 times 0.72 than plus 0.21 which equals 2.43. That was for the other store. You take the answers from before and mutiply them to get to 4 quarts. 0.62 times 8 equals 4.96. 0.92 times 4 equals 3.68. 3.68 and 4.96 is bigger than 2.43 so it costs more.
• ﻿Ok that makes sense
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