Drug calculation test help!!! I got a problem help me!!!

[CLASSOF09]

Hey, everyone I have a drug calculation test on Monday...if anyone could help with this problem...The patient is ordered to have 2/3 strength Ensure at 80 ml/hr. Ensure comes in 8 oz. cans. How many ml of water will be added per can to make 2/3 strength? I'm just getting ready for the test. The answer is 120 mls. I just need to know how they arrived at that answers. thank you in advace.

[ghillbert, MSN, NP]

8 oz. = 240 ml.

You know this is two-thirds of the solution you want to give (from the 2/3 equation you were given).

So if you halve it, you learn that each "one-third" is 120ml.

You know you want to add 1/3 water, and you know 1/3 is 120ml.