Q: By how much is 50% of 250 greater than 25% of 400.
Options:
(A) 25
(B) 26
(C) 29
(D) 39
(E) 26
A: OK... Stream of consciousness: (50/100) * 250 (25/100) * 400
125 - 100 = 25
The answer is (B).

Q: List K consists of 10 consecutive integers. If -4 is the least integer in list K, what is the range of the positive integers in list K?
Options:
(A) 5
(B) 6
(C) 7
(D) 11
(E) 4
A: OK... Stream of consciousness: Answer = E = 4
If least = -4, then largest = 5
Range = 5 - 1 = 4
The answer is (E).

Q: A train running at the speed of 60 km/hr crosses a pole in 6 seconds. Find the length of the train.
Options:
(A) 150 m
(B) 145 m
(C) 100 m
(D) 135 m
(E) 155 m
A: OK... Stream of consciousness: Speed = 60*(5/18) m/sec = 50/3 m/sec
Length of Train (Distance) = Speed * Time
(50/3) * 6 = 100 meter
The answer is (C).

Q: Some persons can do a piece of work in 20 days. Two times the number of these people will do half of that work in?
Options:
(A) 3
(B) 4
(C) 5
(D) 6
(E) 8
A:
OK... Stream of consciousness: 20/ (2 * 2) = 5 days
The answer is (C).