Five books P, Q, R, S and T are kept one above the other (not necessarily in the same order). Only S is between P and Q. T is just below P. S is in the middle. How many books are between R and T?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 3
Number the five places 1 to 5 from the top and fix the clues one by one, starting with the one that gives a definite place:
S is in the middle, so S is in place 3.
Only S is between P and Q, so P and Q take places 2 and 4, one each.
T is just below P. If P were in place 2, T would need place 3, which is S’s. So P is in place 4 and T in place 5, and Q is in place 2.
The only place left, 1, is R’s.
Between R (top) and T (bottom) lie Q, S and P, that is, 3 books.
