Problema Solution
Ken can build a fence in 4 days. His niece Sara can do it in 4.5 days. How long would it take them together?
Answer provided by our tutors
let 'x' be the number or days they need to build the fence together
1/4 + 1/4.5 = 1/x
by solving we find
x = 2.12 days
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the need 2.12 days to build the fence together.