exam Maths Puzzle Numerical Ability

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4.10*10-4 = 2x/(.15-x)(.30-x)

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exam Other Question

5(7x-5)+(-16)/(-1) Larry 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?