book Maths Puzzle Numerical Ability

Could you please help me with this?

Suppose 240 square tiles, each 25 cm on a side, are needed to cover a rectangular floor. The floor is 5 meters long. How wide is the floor?

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book Other Question

Simplify the radical . Assume that all variables represent positive numbers.

square root 8xy^2
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square root 5xy

Explain in detail please?
Thank you what equation do I use for this type of problem?

A BOND PAYS 12% ANNUAL INTEREST COMPOUNDED CONTINUOUSLY. IF $10,000 IS INVESTED INITIALLY, WHEN WILL THE BOND BE WORTH $30,000? ROUND TO THE NEAREST YEAR.