exam Maths Puzzle Numerical Ability

Is sqrt x^2=x an identity (true for all values of x)?
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Here's my question: Bob invested $20,000, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%? I got $11,000, but I d In a box, there are 25 coins consisting of quarters, dimes and nickels with a total amount of $2.75. If the nickels were dimes, the dimes were quarters and the quarters were nickels, the total amount would be $3.75. How many quarters are there?