answer:
step-by-step explanation:
Hope this helps :)
Answer:
8 dollars
Step-by-step explanation:
if "x" is his weekly allowance:
x-0.5x+8=12
Dan make x dollars, then he spend 0.5x dollars and he earned 8 dollars, and that is 12 dollars.
0.5x=12-8
x=8 dollars
Let x be the 10% solution and y be the 4% solution.
.1x + .04y = .07(4)
x + y = 4
These are the two equations.
Solve the equations.
.6y = 1.2
y = 2
Plug this back into the second equation to get x = 2.
Therefore the Chemist must mix 2 liters of the 10% solution with 2 liters of the 4% solution to get 4 liters of the 7% solution.
Answer:
the answer is -4x-2........
