exam Maths Puzzle Numerical Ability

I need to write an algebraic expression for the followins. 5 more than a number

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exam Other Question

Solve for a. 2√a-1 = 4√a
If you could show every step I would appreciate it!!!

A kitchen floor measures 12ft 8in wide by 18ft 9in long. The floor is being covered with tiles that are 8 inch square. How many titles must be bought to cover the floor..

12.8 X 18.9 = 241.92/8 = 30.24
31 titles are needed