Answer:
150 mL
Step-by-step explanation:
Let x represent the quantity of 75% solution needed. The total amount of alcohol in the 60% mixture will be ...
75%·x + 10%·45 = 60%·(x+45) . . . . . there will be x+45 mL of solution in the end
0.15x = 22.5 . . . . . . . . . . . . . . . . . . . . simplify, subtract .60x+4.5
22.5/0.15 = x = 150 . . . . . . . . . . . . . . mL of 75% solution needed
You will need 150 mL of the 75% solution.
= -7 Multiply both sides by 10
x = -70
C. x = -70
Answer:
6x+5
Step-by-step explanation:
2x+4x =6x
10-5=5
6x+5
The answer to this problem is (x,y) = (-4,2)
