Casey is making a flower arrangement with roses(r) and carnations(c). The cost of each rose is $0.50 and the cost of each carnation is $0.10. The arrangement has a total of 80 flowers and the flower cost was $20. How many of each flower did Casey put in her arrangement?

Question

mathstudent55 · Answer

Since r and c are the numbers of roses and carnations, and the total number of flowers is 80, you can write
r + c = 80

mathstudent55 · Answer

Now you need to deal with the cost.
Using the given prices,
how much do r roses cost?
How much do c carnations cost?
Add those up and set it equal to $20
Then solve the system of equations for r and c.