Read the details provided below carefully and answer the following question.

A certain number of persons sit in a row facing north. E is the only neighbor of Q. Five persons sit between E and T. K sits immediately to the right of T. B sits second to the right of K. Two persons sit between K and Y. The number of persons sitting between E and H is twice the number of persons sitting between B and Y. The number of persons sitting to the right of Y is four less than the number of persons sitting to the left of Y. More than twelve persons sit in the row.

How many persons sit in the row?

The correct answer is 19 (Option 2).

Let us solve this linear seating arrangement puzzle step-by-step by analyzing all given conditions.

Step 1: Understand the orientation and initial conditions.

All persons sit in a straight row facing North (Left is to the west, Right is to the east).

1. "E is the only neighbor of Q."
This means Q is at one extreme end of the row, and E is placed adjacent to Q. Therefore, the sequence is either (Q, E) at the left end or (E, Q) at the right end.

Step 2: Place T, K, B, and Y relative to E.

2. "Five persons sit between E and T."
3. "K sits immediately to the right of T."
4. "B sits second to the right of K."
5. "Two persons sit between K and Y."

Let us test Case 1: Q is at the extreme left end.

Position sequence from left to right starting from position 1:
Pos 1: Q
Pos 2: E
Five persons between E and T means T is at position 2 + 5 + 1 = 8.
Pos 8: T
Pos 9: K (immediately to the right of T)
Pos 11: B (second to the right of K)

Now, place Y relative to K (Pos 9):
Two persons sit between K and Y. So Y can be at position 9 - 3 = 6 or position 9 + 3 = 12.

Let us check Y at position 12:
Number of persons sitting between B (Pos 11) and Y (Pos 12) = 0.
The problem states: "The number of persons sitting between E and H is twice the number of persons sitting between B and Y."
Since persons between B and Y = 0, the number of persons between E and H = 2 × 0 = 0. Thus H would be next to E (Pos 3 or Pos 1). But Pos 1 is Q, so H would be at Pos 3.

Step 3: Determine the total number of persons using Y's position.

Let the total number of persons in the row be $''N''$.

The condition states: "The number of persons sitting to the right of Y is four less than the number of persons sitting to the left of Y."

If Y is at position 12:
Number of persons to the left of Y = 11.
Number of persons to the right of Y = 11 - 4 = 7.
Therefore, total number of persons $''N''=\; 12\; +\; 7\; =\; 19$.

Let us verify all constraints with $''N''=\; 19$:

- Total persons = 19 (which satisfies "More than twelve persons sit in the row").
- Sequence of positions:
Pos 1: Q
Pos 2: E
Pos 3: H (0 persons between E and H, which is 2 × 0 persons between B at 11 and Y at 12)
Pos 8: T
Pos 9: K
Pos 11: B
Pos 12: Y
- Persons to the left of Y (Pos 12) = 11.
- Persons to the right of Y (Pos 12) = 19 - 12 = 7.
- Difference = 11 - 7 = 4, which perfectly satisfies the condition "four less than the number of persons sitting to the left of Y".

Thus, the total number of persons sitting in the row is 19.