SOLUTION: substitute several sets of values for two of t, s, and T variables and solve the equation for the third variable. 1) Steve takes 12 hours to finish painting a fence and Janet ta

Question 821526: substitute several sets of values for two of t, s, and T variables and solve the equation for the third variable.
1) Steve takes 12 hours to finish painting a fence and Janet takes 9 hours to finish painting the same fence. How long would it take if they painted the fence together?

Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
1/12+1/9=1/x
9/108+12/108=1/x
21/108=1/x
108/21=x
3*36/3*7=x
36/7=x
5 1/7=x

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