Solution Problems
A portion of an 80% solution is mixed with two liters of a 30% solution to form
a 40% solution. How much of the 80% solution was used?
Analysis:
This problem uses the formula
volumn X percent = solvent and the sum equation that the amount
of solvent in the combined solution must be the sum of the amounts in the
individual solutions. The solution of the problem requires three entries
in the table. One row for solution 1, one for solution 2, and one for
the combined solution. The formulas in this table are incomplete because
the total amount of solvent is not given numerically. However, the key
to this problem can be obtained by observing that the amount of "combined
solvent" must be identical for the solvent row equation and combined
column equation. Equating these two expressions allows the problem
to be solved.
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