document.write( "Question 140436: A jar has twice as many red marbles as white marbles and the ratio of blue marbles to white marbles in the jar is 3:5. There are only red, white and blue marbles in the jar. If there are 2100 more red marbles than blue ones, how many marbles are in the jar altogether?\r
\n" ); document.write( "\n" ); document.write( "so far I came up with 6600 white, 11000 blue and 13200 red but that gives me 2200 more red and I need 2100. I just cant think anymore.. Am I close? Maria
\n" ); document.write( "

Algebra.Com's Answer #102271 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
A jar has twice as many red marbles as white marbles
\n" ); document.write( "Eq: r -2w + 0 = 0
\n" ); document.write( "----------------------
\n" ); document.write( "and the ratio of blue marbles to white marbles in the jar is 3:5
\n" ); document.write( "Eq: 0 - 5w + 3b = 0
\n" ); document.write( "----------------------
\n" ); document.write( "There are only red, white and blue marbles in the jar.
\n" ); document.write( "If there are 2100 more red marbles than blue ones
\n" ); document.write( "Eq: r + 0 -b = 2100
\n" ); document.write( "---------------------
\n" ); document.write( "how many marbles are in the jar altogether?
\n" ); document.write( "-------------------
\n" ); document.write( "You have three equations with three unknows:
\n" ); document.write( "Solving the set of equations you would get:
\n" ); document.write( "r = 12600 red marbles
\n" ); document.write( "w = 6300 white marbles
\n" ); document.write( "b = 10500 blue marbles
\n" ); document.write( "==============
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
\n" ); document.write( "
\n" ); document.write( "
\n" );