In Sakura's garden for every 5 red flowers there are 10 yellow flowers. There are a total of 75 yellow and red flowers in her garden. How many red flowers are in Sakura's garden?

Let the number of red flowers be represented by the variable "r" and the number of yellow flowers be represented by the variable "y". From the given information, we have the equation r = 2y (since for every 5 red flowers there are 10 yellow flowers). Additionally, we know that the total number of flowers is 75, so we have the equation r + y = 75. Substituting the first equation into the second equation, we get 2y + y = 75, which simplifies to 3y = 75. Therefore, y = 25. Substituting y back into the first equation, we find that r = 2(25) = 50. Thus, there are 50 red flowers in Sakura's garden.