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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

What is the difference between 40% of 50% of 60 and 50% of 60% of 70?

(A) $9$ (B) $8$ (C) $7$ (D) $6$ (E) $5$

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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.