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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

Which integer $n$ satisfies $\frac{3}{10} < \frac{n}{20} < \frac{2}{5}$ ?

(A) $3$ (B) $4$ (C) $5$ (D) $6$ (E) $7$

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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.