book Maths Puzzle Numerical Ability

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

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book Other Question

seven times a number is the same as 12 more than 3 times the number. Find the number. we have to write an equation plus solve it. how many liters of a 30% alcohol solution must be mixed with 80 liters of a 80% solution to get a 50 % solution?