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25-01-2017
Chemistry

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Melissa uses a sunscreen with an spf rating of 20. what does this does this mean?

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CUTIEPIE4U CUTIEPIE4U

25-01-2017

If the SPF rating is 20 then it means it would provide 20 times the protection instead of no sunscreen and 20 times longer someone would take before the person started to burn or in this case 200 minutes.

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