SOLUTION: They have found that the ocean filters 18% of the sunlight for each 4 feet they descend. HOw much sunlight is filtered at a depth of 20 feet? The divers need to use spotlights when

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Question 91186: They have found that the ocean filters 18% of the sunlight for each 4 feet they descend. HOw much sunlight is filtered at a depth of 20 feet? The divers need to use spotlights when the amount of sunlight is less than 10% will they nee spotlights at 48 feet?
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
4/.18=20/X
4X=20*.18
4X=3.6
X=3.6/4
X=.9 OR 90% FILTERING OF SUNLIGHT @ 20 FEET.THEY'LL NEED LIGHTS BELOW 20 FEET THUS THEY'LL NEED THEM ALSO @ 48 FEET