 
 <prompt> Adrian age na three times Harriet age, and Harriet na half Zack age. Calculate the average age of the three in three years if Harriet dey 21 years old now. Think and write for python. <response>: ```
def solution():
    """Adrian age na three times Harriet age, and Harriet na half Zack age. Calculate the average age of the three in three years if Harriet na 21 years old now."""
    harriet_age = 21
    adrian_age = 3 * harriet_age
    zack_age = 2 * harriet_age
    average_age = (adrian_age + harriet_age + zack_age) / 3
    average_age_in_three_years = average_age + 3
    result = average_age_in_three_years
    return result
``` 