To solve this problem you must apply the proccedure shown below:
1. Let's call: the number of roses and the number of lilies.
2. You must make a system of equation based on the information given in the problem above:
3. Use the method of substitution. First, solve for in the second equation, then substitute it into the first equation, and then solve for :
4. Now, substitute into the second equation:
Therefore, the answer is: roses and lilies.