book Maths Puzzle Numerical Ability

(square root of x+11)=(square root of x)+1

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Need help please.

6) The volume of a cube is given by V = s³. Find the length of a side of a cube if the Volume is 1000 cm³.

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It takes you 6 hours to do a job. It takes a friend 3 hours to do the same job. How long would it take both of you working together to do the job?