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Combinatorics Difficulty 2.0 Junior Find the answer United Kingdom

A group of $42$ children all play tennis or football, or both sports. The same number play tennis as play just football. Twice as many play both tennis and football as play just tennis. How many of the children play football?

(A) $7$ (B) $14$ (C) $21$ (D) $28$ (E) $35$

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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.