Using unitary method, 8 people will paint 8 fences in 10 hours.
What is unitary method?
The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value.
Time taken by 4 people to paint 2 fences = 5 hours
Time taken by 8 people to paint 2 fences = 5/2 hours = 2.5 hours
Time taken by 8 people to paint 1 fence = 2.5/2 hours = 1.25 hours
Time taken by 8 people to paint 8 fences = 1.25 * 8 = 10 hours
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