exam Maths Puzzle Numerical Ability

Mike invested $6000 for one year. He invested part of it at 9% and the rest at 11%. At the end of the year he earned $624 in interest. How much did he invest at each rate?

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exam Other Question

The equation y = 14x – 80 describes the amount of money a class of students might earn from candy bar sales. What are the slope and y-intercept of this line? Express in simplest form with rationalized denominators: a sqrt 2x^3 + sqrt 8a^2x^3