exam Maths Puzzle Numerical Ability

Divide:

7x^5y^5-21x^4y^4+14x^3y^3
_________________________ =??????? Helpppppp!

7x^3y^3

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exam Other Question

A bookshelf holds 4 mysteries, 3 biographies, 1 book of poetry, and 2 reference books. If a book is selected at random from the shelf, find the probability that the book selected is a biography or reference book.

Thank You Could any one of you help me out in solving the below problem. I tried a lot, but failed.

ax + by = 4; ax^2 + by^2 = -3; ax^3 + by^3 = 2,
then what is the value of (2x-1)(2y-1)?

Thanks.
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