Q: If x is a positive integer, which of the following could NOT be the square of x?
Options:
(A) 5,008,644
(B) 5,004,169
(C) 4,999,696
(D) 4,995,225
(E) 4,990,752
A: OK... Stream of consciousness: A perfect square will never end in 2, 3, 7 or 8. (last digit cannot be 2, 3, 7 or 8)
Here E is the odd one out.
The answer is (E).

Q: What should come in place of the question mark (?) in the following equation?
5679 + 1438 – 2015 = ?
Options:
(A) 5192
(B) 5012
(C) 5102
(D) 5002
(E) None of these
A: OK... Stream of consciousness: ? = 5679 + 1438 – 2015 = 5102
The answer is (C).

Q: n what time will a railway train 60 m long moving at the rate of 36 kmph pass a telegraph post on its way?
Options:
(A) 2
(B) 7
(C) 8
(D) 6
(E) 9
A: OK... Stream of consciousness: T = 60/36 * 18/5 = 6 sec
The answer is (D).

Q: The average length of the sides of triangle ABC is 12. What is the perimeter of triangle ABC?
Options:
(A) 4
(B) 6
(C) 12
(D) 24
(E) 36
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
OK... Stream of consciousness: (average) = (perimeter)/3;
12 = (perimeter)/3;
(perimeter) = 36.
The answer is (E).