I can write a ratio given the relationship between two quantities.

There are 12 boys in a class and 17 girls in a class. Write a ratio to represent the relationship between the number of boys and girls.

I can write a ratio given the relationship between two quantities.

A class has 15 people who prefer dogs and 10 people who prefer cats. Write a ratio to represent the relationship between the number of people who prefer dogs to the number of people who prefer cats.

I can write a ratio given the relationship between two quantities.

A restaurant has 21 items with beef in it and 7 items with chicken in it. Write a ratio to represent the relationship between the number of items with beef in it compared to the number of items with chicken in it.

I can solve proportions.

$$\frac{49}{x}=\frac{7}{2}$$  

I can solve proportions.

$$\frac{2}{7}=\frac{6}{x}$$  

I can solve proportions.

$$\frac{x}{9}=\frac{7}{3}$$  

I can solve proportions with a binomial.

$$\frac{x-5}{5}=\frac{x-8}{2}$$