Q: An enterprising businessman earns an income of Re 5 on the first day of his business. On every subsequent day, he earns an income which is just thrice of that made on the previous day. On the 10th day of business, he earns an income of:
Options:
(A) 21
(B) 22
(C) 20
(D) 45
(E) 30
A: OK... Stream of consciousness: 2nd day he earns = 3(2 5)
3rd day he earns = 3(3 5)
On 20th day he earns 3(20 -5) = 45 rupees
The answer is (D).

Q: If in the word 'DISTURBANCE', the first letter is interchanged with the last letter, the second letter is interchanged with the tenth letter and so on, which letter would come after the letter T in the newly formed word ?
Options:
(A) S
(B) C
(C) T
(D) R
(E) U
A: OK... Stream of consciousness: The new letter sequence is E C N A B R U T S I D
Clearly, S comes after T
The answer is (A).

Q: Find a a prime number the options below.
Options:
(A) 78
(B) 80
(C) 81
(D) 82
(E) 83
A: OK... Stream of consciousness: Clearly, 83 is a prime number.
The answer is (E).

Q: What is the probability that Company Q's advertisement will be one of the first two be shown during the first commercial break?
Options:
(A) 1/ 225
(B) 1 / 30
(C) 1 /15
(D) 2 / 15
(E) 4 /15
A:
OK... Stream of consciousness: Q 1/15 + (14/15) * 1/14 = 2/15
The answer is (D).