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Question

A marine biologist is testing a new spray, he applies the spray to a sample of 200 square feet of the beach. 184 square feet is free of red tide in 7 days. Under same conditions, if spray has been used for the entire area of 10000 square feet, then calculate the area free from red tide.

A
800 sq ft
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B
920 sq ft
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C
8,000 sq ft
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D
9,200 sq ft
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Solution

The correct option is A 800 sq ft
Given 184 square feet area is free of red tide in 200 square feet in sample
Then area not free from red tide =200184=16 sq feet
Then entire area free from red tide in 10000 sq feet = 16200×10000=800 square feet

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