Ratio problem with basic algebra (new HD)

Learn more: http://www.khanacademy.org/video?v=ITVQrzDSekU
A slightly more involved ratio problem with algebra

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Length: 9 minutes

More advanced ratio problem--with Algebra (HD version)

Length: 7 minutes

Alternate Solution to Ratio Problem (HD Version)

Length: 7 minutes

Introduction to Ratios