Final answer:
Clement is 8 years old.
Step-by-step explanation:
To find the age of Clement, we first need to assign variables to the ages of the three individuals. Let x be Clement's age. Brian's age is then 3x, and Anna's age is 2 times Brian's age, which is 2(3x) = 6x.
The sum of their ages is given as 80, so we can write the equation x + 3x + 6x = 80.
Combining like terms, we have 10x = 80, and dividing both sides by 10, we find that x = 8.
Therefore, Clement is 8 years old.