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Number theory Difficulty 2.0 Junior Find the answer United Kingdom

How many pairs of two-digit positive integers have a difference of $50$ ?

(A) $10$ (B) $20$ (C) $25$ (D) $35$ (E) $40$

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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.