book Maths Puzzle Numerical Ability

Perform the indicated operation:

(10x+11/x^2-4) - (3/x-2)

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book Other Question

Put four different numbers in a circle so that when you add the numbers at the end of each line you always get a square number.
( where circle in the figure represents each of the Nimrods's bank charges a monthly checking account fee of $8.50 plus $0.25 per check cleared over 30 checks. If he was charged $12.75 for the month, determine the total number of ch