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Algebra Difficulty 2.0 Junior Prove it Canada

Ophelia buys 10 tickets with an average cost of \$14. Suppose that she buys $n$ more platinum tickets. The new average cost of the tickets that she has bought is \$20. What is the value of $n$ ? Explain how you obtained your answer.

Want a route through all this instead of an archive? The track puts 2,604 problems in a working order, from Junior Challenge level to the IMO shortlist.

Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.