The total number of flowers are 50. And the ratio from roses to daisies are 1:4. How many roses does she have?

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