# SOLUTION: I'd really appreciate your input on this problem. Tom and David both collected a total of 480 marbles. Tom stacked each column with 6 marbles. and David stacked each column wit

Algebra ->  Algebra  -> Customizable Word Problem Solvers  -> Misc -> SOLUTION: I'd really appreciate your input on this problem. Tom and David both collected a total of 480 marbles. Tom stacked each column with 6 marbles. and David stacked each column wit      Log On

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 Click here to see ALL problems on Miscellaneous Word Problems Question 92432: I'd really appreciate your input on this problem. Tom and David both collected a total of 480 marbles. Tom stacked each column with 6 marbles. and David stacked each column with 9 marbles. They stacked 72 columns together. Write an equation using this information. Well, i came up with 56 columns for Tom; and 16 columns for David which equal 72 together. Tom collected 56columns x 6marbles=336 David collected 16columns x 9marbles=144 Tom plus David=480marbles. But, how do i write an equation for these numbers??Answer by scott8148(6628)   (Show Source): You can put this solution on YOUR website!start by defining variables ... let t=Tom's marbles, let d=David's marbles ... then write equations "Tom and David both collected a total of 480 marbles" ... t+d=480 "Tom stacked each column with 6 marbles. and David stacked each column with 9 marbles. They stacked 72 columns together" ... (t/6)+(d/9)=72 this gives you two equations and two unknowns ... the easiest solution method is probably substitution