exam Maths Puzzle Numerical Ability

Sam earned 1155 in interest on a total investment 15000 this past year, if part of the money was invested at 6% and the remainder at 9% how much was invested at 6%

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by solving the first ine we get x<2, the second one we will obtain x>2, theses solutions have only one meaning and that is x=2. Simplify the following expression. (-xt^2)(-2x^2t)^4