q: Which one of the following is not a prime number?
Options:
(A) 31
(B) 61
(C) 71
(D) 73
(E) 91
a: Stream of consciousness: 91 is divisible by 7. So, it is not a prime number. The answer is (D).

question: The average of four results is 222 and that of the first three is 219. The fourth result is?
Options:
(A) 231
(B) 201
(C) 85
(D) 192
(E) 215
answer: Stream of consciousness: 4 * 222 3 * 219 = 231 The answer is (A).

q: A train running at the speed of 60 km/hr crosses a pole in 15 sec. What is the length of the train?
Options:
(A) 120 m
(B) 190 m
(C) 115 m
(D) 110 m
(E) 250 m
a: Stream of consciousness: Speed = 60 * 5/18 = 50/3 m/sec
Length of the train = speed * time = 50/3 * 15 = 250 m The answer is (E).

question: The speed of a train is 90 kmph. What is the distance covered by it in 10 minutes?
Options:
(A) 277
(B) 266
(C) 300
(D) 767
(E) 211
answer: Stream of consciousness: 1/2:1/3:1/4 = 6:4:3
3/13*1300 = 300 The answer is (C).

q: The inverse ratio of 3: 7: 1 is?
Options:
(A) 2:3:7
(B) 2:3:9
(C) 2:3:2
(D) 2:3:6
(E) 2:3:1
a: Stream of consciousness: 1/3: 1/7: 1/1 = 7:3:21 The answer is (E).

q: How many positive integers less than 60 have a reminder 01 when divided by 4?
Options:
(A) 13
(B) 14
(C) 15
(D) 16
(E) 17
a:
Stream of consciousness: 1 also gives the remainder of 1 when divided by 4. So, there are total of 15 numbers. The answer is (C).