Solve the problem.
Let M, J, B = fences per hour for Mike, Joe, Bill respectively.
Let's Franklin be the person can work as fast as Mike and Joe together.
So, F = M + J
From the first equation, we get
4 F + 2 B = 1 fence
From the second equation, we get
2 F + 5 B = 1 or
4 F + 10 B = 2
Subtracting equation (i) from equation (ii) , we get
8 B = 1
B = 1/8
So, Bill paints the fence in 8 hours.
From equation (iii) we have
6 M + 2 J + 1/8 = 1
6 M + 2 J = 7/8 (iv)
From equation (ii) we have
2 M + 2 J = 3/8 (v)
Subtracting equation (iv) f...
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