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The two numbers $a$ and $b$ both lie between $-5$ and $10$ inclusive. What is the largest possible value of $a-b$?

(A) $-5$ (B) $0$ (C) $10$ (D) $15$ (E) $20$

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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, ordering) added by this project. Solutions are the publisher's, linked not copied.