Answer: Fraction of red tulips of Solan is greater than fraction of red tulips of Julie by 0.75-0.5=0.25.
Explanation:
Since we have given that
In case of Solan:
Number of red tulips = 15
Total number of tulips = 20
In case of Julie :
Number of red tulips = 10
Total number of tulips = 20
So, Fraction of red tulips of Solan is given by

Fraction of red tulips of Julie is given by

So, Fraction of red tulips of Solan is greater than fraction of red tulips of Julie by 0.75-0.5=0.25.