For this, the first step is to find out how parts there are.
If the flowers are 1 part roses to 4 parts daisies, there are a total of 5 parts.
If the flowers are evenly split into 5 parts, there must be 10 flowers in each part.
50/5 = 10
Roses : Daisies
1 : 4
The bunch is 1 part roses
1 x 10 = 10 roses