Aconvenience store sells two brands of orange juice .brand a contains 8 oz and cost $1.28. brand b contains 12 oz and costs $1.68. what is the difference in cost in dollars per oz between the two brands of juice?

21 birds.

Step-by-step explanation:

Let B represent the number of birds and C represent the number of cats.

We have been given that an animal shelter spends $1.50 per day to care for each bird, so the amount spent on B birds will be 1.50B.

The animal shelter spends $8.50 per day to care for each cat, so the amount spent on C cats will be 8.50C.

Alexander noticed that the shelter spent $108.00 caring for birds and cats on Tuesday. We can represent this information in an equation as:

Alexander found a record showing that there were a total of 30 birds and cats on Tuesday. We can represent this information in an equation as:

We will use substitution method to solve system of linear equations.

From equation (2) we will get,

Substituting this value in equation (1) we will get,

Let us subtract 255 from both sides of our equation.

Let us divide both sides of our equation by -7.

Therefore, there were 21 birds at the shelter on Tuesday.