When is 2x greater than x? Compare algebraic expressions with linear inequalities.

Let \(a, b, c, d,\) and \(e\) be real numbers such that

\(a+b<c+d\)

\(b+c<d+e\)

\(c+d<e+a\)

\(d+e<a+b\).

Which among \(a,b,c,d,e\) is the largest and smallest?

Put your answer in the form (largest, smallest). For example, if you think the largest is \(c\) and the smallest is \(e\), then your answer should be \((c, e)\).

To Fred, she sold 2 books, and one fifth of what was left.

Later to Joan she sold 6 books, and one fifth of what then remained.

If she sold more books to Fred than to Joan, what was the least possible number of books in her original collection?

Find the smallest positive integer \(n\) such that there exists an integer \(m\) for which the inequality above is fulfilled.

What is the minimum score that Mary could have gotten to be certain of the above situation?

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