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Khan Academy on a Stick
Proportions 2 exercise examples
Ratios with algebra
The Golden Ratio
Ratio problem with basic algebra (new HD)
Writing proportions
More advanced ratio problem--with Algebra (HD version)
Advanced ratio problems
Alternate Solution to Ratio Problem (HD Version)
Another Take on the Rate Problem
Find an Unknown in a Proportion
Find an Unknown in a Proportion 2
Proportions 2 exercise examples
Mountain height word problem
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