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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

Gill is now 28 years old and is a teacher of Mathematics at a school which has 600 pupils. There are 30 more girls than boys at the school. How many girls are at Gill's school?

(A) $270$ (B) $300$ (C) $315$ (D) $330$ (E) $345$

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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.