Kaukab is standing in a cafeteria line. In the line, the number of people that are ahead of her is equal to two times the number of people that are behind her. There are $n$ people in the line. A possible value of $n$ is
(A) 23
(B) 20
(C) 24
(D) 21
(E) 25
Suppose that there are $p$ people behind Kaukab.

This means that there are $2 p$ people ahead of her.

Including Kaukab, the total number of people in line is $n=p+2 p+1=3 p+1$, which is one more than a multiple of 3 .

Of the given choices $(23,20,24,21,25)$, the only one that is one more than a multiple of 3 is 25 , which equals $3 \times 8+1$.

Therefore, a possible value for $n$ is 25 .

ANSWER: (E)