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Maths Puzzle
Numerical Ability
Colin invested $24,000, part at 18% and part at 16%. If the total interest at the end of the year is $4,160, how much did he invest at 18%?
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How do I do this problem?
10x^2 - 30x + 20 / x^2 - 1
-2y=26 i do not remember how to do this kind of problem