SOLUTION: Steven and Kim had 475 marbles. Steven and Tim had 640 marbles. Tim had twice as many marbles as Kim. How much marble did Steven have?

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: Steven and Kim had 475 marbles. Steven and Tim had 640 marbles. Tim had twice as many marbles as Kim. How much marble did Steven have?      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 765941: Steven and Kim had 475 marbles. Steven and Tim had 640 marbles. Tim had twice as many marbles as Kim. How much marble did Steven have?
Answer by MaartenRU(13) About Me  (Show Source):
You can put this solution on YOUR website!
Let us call the number of marbles Steven had x.

Then Kim had 475-x marbles, and Tim had 640-x marbles.

Tim had twice as many as Kim, so 640-x is the double of 475-x.

640-x=2%28475-x%29=950-2x
Subtracting 640-2x from both sides gives us
x=310