exam Maths Puzzle Numerical Ability

Bill sells his vintage 1974 Road Runner for $9500. He uses this money to invest in a 36 month CD that pays 4.12% interest compounded quartely. How much money will he receive when

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2 positive real numbers that differ by 1 and have a product of 1 A common mistake when solving equations is the following:

The equation: 2(x -2) = x +3

First step in solving: 2x -2 =x +3

Write a clear explanation of what error has been made. What could be done to avoid this error?