A recipe for oatmeal cookies calls for 2 cups of flour for every 1.5 cups of oatmeal. How much flour is needed for a big batch of cookies that uses 3.6 cups of oatmeal? You will need cups of flour?

i do not know this sorry : (

ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

source:  

yes they are the same