book Maths Puzzle Numerical Ability

I need help on transforming equations. ifu can, e-mail me please!

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Solve this problem.

Office space. The length of a professor`s office is x feet, and the width is x + 4 feet. Write a polynomial that represents the area. and find the area if x = 10ft. Need help coming up with an equation for this word sentence. Thanks in advance.

The sizes of three numbers are in the ratio of 9 : 5 : 2 and their sum is 54. What are the three numbers?