exam Maths Puzzle Numerical Ability

Kevin earned $165 interest for 1 year on an investment of $1500. At the same rate, what amount of interest would be earned by an investment of $2500.?

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exam Other Question

I am unable to work out the following:

Find the arithmetic operation for adding the following complex numbers (4+j6)+(7-j3)+(7-j8) thanks for any help. The sum of two numbers is 39. Their difference is 7. What are the two numbers? Show both equations and your method for solving as well as the solution.