Discussion
Who among the following has as many people sitting to this right, as to his left?
Answer: C
The person with as many people on the right as on the left is Q.
Placing the seven gives the line, from left to right, W T S Q P V R. Put T in place p; then W is p − 1, Q is p + 2 and V is p + 4. V cannot be at an end, so p + 4 is at most 6, and W needs p of at least 2, so p = 2: W 1, T 2, Q 4, V 6. R is not next to Q, so R is not in 3 or 5 and takes 7. S is not next to V, so S is not in 5 or 7 and takes 3. P takes 5.
In a line of seven, the middle person (place 4) has three on each side. Place 4 is Q. S has two on the left and four on the right, P has four and two, and R is at the end.
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