On a sunny day mark can stay in the sun for 20 minutes before he gets sunburnt. He wants to sunbathe for 3 hours. What is the lowest level of sun protection that he should use : 5, 15, 20, 30, 50
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On A Sunny Day Mark Can Stay In The Sun For 20 Minutes Before He Gets Sunburnt He Wants To Sunbathe For 3 Hours What Is The Lowest Level Of Sun Protection That class=