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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

For what value of $x$ is $64^x$ equal to $512^5$ ?

(A) $6$ (B) $7.5$ (C) $8$ (D) $16$ (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.