exam Maths Puzzle Numerical Ability

Helen Weller invested $15,000 in an account that pays 10% simple interest. How much additional money must be invested in an account that pays 13% simple interest so that the averag

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cot x -tan x = 2 The sum of the ages of a married couple is 60. If three times the age of the husband is nine less than four times the age of the wife, how old are they now?