Watch the videos and try the practice problems on the left pane ( See next post).  Practice questions from text are on p.182-183 Q.1-12

Equivalent ratios

https://www.khanacademy.org/math/pre-algebra/pre-algebra-ratios-rates/pre-algebra-ratios-intro/v/equivalent-ratios

https://www.khanacademy.org/math/pre-algebra/pre-algebra-ratios-rates/pre-algebra-ratios-intro/v/ratios-for-recipes

Ratio Problems

https://www.khanacademy.org/math/pre-algebra/pre-algebra-ratios-rates/pre-algebra-ratios-intro/v/ratio-word-problem-examples

https://www.khanacademy.org/math/pre-algebra/pre-algebra-ratios-rates/pre-algebra-ratios-intro/v/understanding-equivalent-ratios