SOLUTION: Two bricklayers, Alan and David, each place 30 bricks per hour. Alan worked three times as many hours as David, and the two of them placed a total of 600 bricks. How many bricks di

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Two bricklayers, Alan and David, each place 30 bricks per hour. Alan worked three times as many hours as David, and the two of them placed a total of 600 bricks. How many bricks di      Log On


   

Question 1095358: Two bricklayers, Alan and David, each place 30 bricks per hour. Alan worked three times as many hours as David, and the two of them placed a total of 600 bricks. How many bricks did David lay?
Answer by josgarithmetic(39627) About Me  (Show Source):
You can put this solution on YOUR website!
David worked t hours and Alan worked 3t hours.

30t%2B30%2A%283t%29=600
t%2B3t=600%2F30
4t=20
highlight_green%28t=5%29-----David worked 5 hours and laid 150 bricks.