exam Maths Puzzle Numerical Ability

9X -6 < -42

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A bag of nickels, dimes, quarters and loonies contain 55 coins with a total weight of 130, worth a total of $12.50. If dimes weigh 1, nickels weigh 2, quarters weigh 3, and loonies weigh 4, how many coins of each type are there? An investment of $20,000.00 will be doubled in 14 years with interest compounded continuously. Find the annual interest rate