SOLUTION: translate the problem into a pair of linear equations in two variables. solve the equations using either elimination or substitution. In a chemistry class, 5 liters of a 4%-saline

Question 310309: translate the problem into a pair of linear equations in two variables. solve the equations using either elimination or substitution.
In a chemistry class, 5 liters of a 4%-saline solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let X be the unknown number of liters of 10% solution,

2.5 liters of 10% solution need to be added.

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