Now this one is a bit hard if you haven't been paying close attention. First, what do you want to know? You want to know how long the bottle will last. You could figure out days/bottle or weeks/bottle and see if the bottle will last longer than 3 weeks or 21 days. So you write down "Answer units = days/bottle" What do you know to start off with that you might need to know? You write down the following: You realize that if a 4-oz bottle is half-full, then there is 2 oz of tonic in it, but you could figure it out dimensionally if you wanted to: You then end up with "days/half-bottle" in your answer, but it's easier to just go with 2 oz/bottle. What should you use as a starting factor? You pick 128 lb because it's something you're given and starting with weight usually works. You set the problem up: Houston, we have a problem. You up with units reversed from what you wanted. You figured out how much of the bottle you would use in one day. What to do? You could hit the button on 1/x your calculator if it had one, or invert the answer by dividing 1 by 0.044, or start over with 128 lb on the bottom. What? Can you do that? Sure you can. You could even put 128 lb on the end and on the bottom, or put it in the middle somewhere. You decide to start over, this time picking a starting factor that already has "day" or
Now this one is a bit hard if you haven't been paying close attention. First, what do you want to know? You want to know how long the bottle will last. You could figure out days/bottle or weeks/bottle and see if the bottle will last longer than 3 weeks or 21 days. So you write down "Answer units = days/bottle" What do you know to start off with that you might need to know? You write down the following: You realize that if a 4-oz bottle is half-full, then there is 2 oz of tonic in it, but you could figure it out dimensionally if you wanted to: You then end up with "days/half-bottle" in your answer, but it's easier to just go with 2 oz/bottle. What should you use as a starting factor? You pick 128 lb because it's something you're given and starting with weight usually works. You set the problem up: Houston, we have a problem. You up with units reversed from what you wanted. You figured out how much of the bottle you would use in one day. What to do? You could hit the 1/x button on your calculator if it had one, or invert the answer by dividing 1 by 0.044, or start over with 128 lb on the bottom. What? Can you do that? Sure you can. You could even put 128 lb on the end and on the bottom, or put it in the middle somewhere. You decide to start over, this time picking a starting factor that already has "day" or