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Algebra Difficulty 2.0 Junior Find the answer United Kingdom

Diego noticed that 20% of 30% of a number was 3 less than 30% of 40% of the same number. What was that number?

(A) $30$ (B) $35$ (C) $40$ (D) $45$ (E) $50$

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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.