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August 1, 2015

Homework Help: math

Posted by Joey on Thursday, September 16, 2010 at 8:59pm.

If you usually burn after 1/2 hour expose to sun, you can lenghten the time you are in the sun to three hours by applying SPF number 6. how long could a person who burns after 1/4 hour stay in the sun using SPF 15 lotion?

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