Homework Help: Algebra

Posted by sami sun on Monday, October 15, 2012 at 6:48pm.

It takes matt 9 hrs longer to build a wall than it takes chris. Working together they can build the wall in 20hrs. how long would it take each working alone to build the wall?

Algebra - mike, Monday, October 15, 2012 at 7:21pm
Chris is x Matt is x+9
2x+9=20
2x=11
x=5.5

Chris = 5.5
Matt= 5.5+9 = 14.5

5.5 +14.5 = 20

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