book Maths Puzzle Numerical Ability

Different interest rates. Mrs. Brighton invested $30,000 and received a total of #2,300 in interest. If she invested part of the money at 10% and the remainder at 5%, then how much did she invest at each rate?

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book Other Question

Find two consecutive positive integers such that the sum of their squares is 85. What is the discriminate in the quadratic equation x^2+11x+121=x+96?