q: How much is 80% of 40 is greater than 4/5 of 15?
Options:
(A) 12
(B) 20
(C) 18
(D) 12
(E) 81
a: Stream of consciousness: (80/100) * 40 â€“ (4/5) * 15
32 - 12 = 20 The answer is (B).


question: A multiple choice test consists of 4 questions, and each question has 5 answer choices. In how many ways can the test be completed if every question is unanswered?
Options:
(A) 24
(B) 120
(C) 625
(D) 720
(E) 1024
answer: Stream of consciousness: 5 choices for each of the 4 questions, thus total of 5*5*5*5 = 5^4 = 625 ways. The answer is (C).


q: 80 370 860 1550 ? 3530
Options:
(A) 900
(B) 2440
(C) 750
(D) 244
(E) 960
a: Stream of consciousness: 10^2 - 20 = 80
20^2 - 30 = 370
30^2 - 40 = 860
40^2 - 50 = 1550
50^2 - 60 = 2440
60^2 - 70 = 3530. The answer is (B).


question: A train 124 m long running at 68 kmph crosses a platform in 19 sec. What is the length of the platform?
Options:
(A) 338
(B) 234
(C) 240
(D) 881
(E) 271
answer: Stream of consciousness: D = 68 * 5/18 = 19 = 358 – 124 = 234 The answer is (B).


q: A train 460 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?
Options:
(A) 40
(B) 87
(C) 48
(D) 21
(E) 14
a: Stream of consciousness: Speed = 45 * 5/18 = 25/2 m/sec
Total distance covered = 460 + 140 = 600 m
Required time = 600 * 2/25 = 48 se The answer is (C).


q: A pipe can fill a cistern in 20 minutes whereas the cistern when full can be emptied by a leak in 28 minutes. When both pipes are opened, find when the cistern will be full?
Options:
(A) 17
(B) 16
(C) 70
(D) 13
(E) 12
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
Stream of consciousness: 1/20 - 1/28 = 1/70
70 minutes The answer is (C).