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Maths Puzzle
Numerical Ability
how many liters of a 30% alcohol solution must be mixed with 80 liters of a 80% solution to get a 50 % solution?
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Write a system of two equations in two unknowns for each problem. Solve each system by substitution.
47.) Different interest rates. Mrs. Brighton invested $30,000 and received a
2x^3-x^2-15x