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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

I add up all even numbers between 1 and 101. Then from my total I subtract all odd numbers between 0 and 100. What is the result?

(A) $0$ (B) $50$ (C) $100$ (D) $255$ (E) $2525$

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Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.