Posted by Britney on Tuesday, December 7, 2010 at 10:56pm.
A 720ml container holds a mixture of red, yellow, and white paint in a 5:3:12 ratio. How much more red paint than yellow paint is present in the mixture?

Math  MathMate, Tuesday, December 7, 2010 at 11:02pm
Add the ratios together and divide 720 mL in proportion to the ratios.
5+3+12=20
So
red = 720*5/20 = 180 mL
yellow = 720*3/20 = ?
white = 12*3/20 = ?
Add up the three quantities and make sure the sum equals 720 mL. 
Math  Britney, Tuesday, December 7, 2010 at 11:04pm
Thank You!