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Step-by-step explanation:

Number of flowers in the garden of Christina = 50
The ration of roses to daisies in Christina's garden = 1:4
Let us assume the common ratio to be = x
Then
x + 4x = 50
5x = 50
x = 50/5
   = 10
Then
Number of roses in the garden of Christina = 1 * 10
                                                                      = 10
Number of daisies in the garden of Christina = 4 * 10
                                                                       = 40
So the number of roses in the garden of Christina is 10 and the number of daisies is 40.