Question 306138
.45x+6/x+6=.78
Solve the given equation step by step.
This is also equal to this system
.45x+6=.78(x+6)
You will get the final answer as
x=4
Therefore, 
4 mg of a metal containing 45% nickel must be combined with 6 mg of pure nickel to form an alloy containing 78% nickel.