 
 <prompt> Elaina dey hold di final concert for her tour. To celebrate her final concert, she make di concert twice as long as her usual concerts. At the end of the concert, she also perform a 15-minute encore. If the runtime of this final concert na 65 minutes then how long, in minutes, do her usual concerts run for? Write a solution in python. <response>: ```
def solution():
    """Elaina dey hold di final concert for her tour. To celebrate her final concert, she make di concert twice as long as her usual concerts. At di end of di concert, she still perform a 15-minute encore. If di runtime of dis final concert na 65 minutes then how long, in minutes, her usual concerts dey run for?"""
    concert_final_runtime = 65
    encore_runtime = 15
    concert_usual_runtime = (concert_final_runtime - encore_runtime) / 2
    result = concert_usual_runtime
    return result
``` 