For this we will use formula that is letting us to input: interest rate, starting funds, how often intereset rate is implemented, period we are observing. Formula looks like this:

where M is money, S is starting funds, "i" is interest rate, cp is compounding period and y is number of years. now we express and calculated for both of them and get
M = 318,479 for Patricks investement.
M = 331,482 for Brooklyn.
Which means Brooklyn's method will pay of more.
Try, please, this:
1) Imagine, that pharmacist used 'x' gr. of 40% solution and 'y' of 70% solution.
Together (20 gr. of 52% sol.) it will be x+y=20.
2) From other side, the pharmacist combined 40x and 70y gramms, after obtaining together it is 52(x+y) gramms. In other words 40x+70y=52(x+y)
3)

Answer: 8 gr. of 70% solution and 12 gr. of 40%.
Answer:
30 2/3
Step-by-step explanation:
First multiply the two exponents
Second solve 2^6
Third multiply 64 times 5 = 320
Then multiply 16 times 3
Then add sums together 368
Lastly multiply 4 times 3 then divide 368 by 12
I hope this helps :)