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%.
You need to do 175 divided by 3.
Negative four hundred sixty five <span />
640. the answer would be 640
Answer:
56
Step-by-step explanation:
z + 12w when z = 8 and w = 4
~Substitute
8 + 12(4)
~Simplify
8 + 48
~Add
56
Best of Luck!