book Maths Puzzle Numerical Ability

the square of a number exceeds 11 times the number by 312. find the number.

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book Other Question

a rectangle has a perimeter of 68 inches. its legnth is 2 inches less than 3 times a width. what are the legth and width of the rectange f(x)=3^X, find the value of X that makes f(x)=17, then explain how you know the answer must be between 2 and 3