exam Maths Puzzle Numerical Ability

Dr. Beaker invested $3000, part at 8% and the rest at 7 1/2%. The total return for one year was $231. How much was invested at each rate?

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How do I solve using a system of two linear equations in two variables?

Barry is 8 years older than his sister. In 3 years, he will be twice as old as she will be then. How old is each now? Beth is 14 years older than Aria. Last Year Beth was three times as old as Aria. How Old is Aria?