book Maths Puzzle Numerical Ability

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

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book Other Question

Can you please help with the following? A work crew of 3 people requires 3 weeks and 2 days to do a certain job. How long would it take a work crew of 4 people to do the same jo how do i solve using a graph for these types of problems? x^3-1=2x^2-3x
or y=2x+10-x^2