book Maths Puzzle Numerical Ability

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

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book Other Question

Solve each system.

x+y+z=-1
2x-y+2z=-5
-x+2y-z=4
the square of anumber exceeds 11 times the number by 312. find the number.