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Question:

Trevor has very fair skin and is planning to take a trip from his home in London to Miami. At minimum, by how much should he increase the SPF in his sunscreen?

A 20
Explaination

Someone at home in the UK with very fair skin should wear SPF 15–30. Someone with very fair skin in Florida needs an SPF of 50+. That means Trevor should increase his SPF by 20–35, a minimum of 20.