q: A does a work in 10 days and B does the same work in 15 days. In how many days they together will do the same work?
Options:
(A) 1
(B) 6
(C) 7
(D) 5
(E) 43
a: Stream of consciousness: A's 1 day work = 1/10; B's 1 day work = 1/15
(A + B)'s 1 day work = (1/10 + 1/15) = 1/6
So, both together will finish the work in 6 days. The answer is (B).

question: A can do a job in 12 days and B can do it in 15 days. A and B working together will finish twice the amount of work in days?
Options:
(A) 22 1/6
(B) 22 1/2
(C) 22 1/0
(D) 22 1/9
(E) 13 1/3
answer: Stream of consciousness: 1/12 + 1/15 = 9/60 = 3/20
20/3 = 20/3 *2 = 13 1/3 days The answer is (E).

q: What is the difference between 62% of 150 nd 20% of 250.
Options:
(A) 16
(B) 17
(C) 43
(D) 19
(E) 20
a: Stream of consciousness: (62/100) * 150 (20/100) * 250
93 - 50 = 43 The answer is (C).

question: 30 pens and 75 pencils were purchased for 510. If the average price of a pencil was 2.00, find the average price of a pen.
Options:
(A) 10
(B) 11
(C) 12
(D) cannot be determined
(E) None of the above
answer: Stream of consciousness: Since average price of a pencil = 2
Price of 75 pencils = 150
Price of 30 pens = (510 150) = 360
Average price of a pen = 36060 = 12 The answer is (C).

q: Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 1 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is?
Options:
(A) 40 gallons
(B) 100 gallons
(C) 120 gallons
(D) 180 gallons
(E) 130 gallons
a: Stream of consciousness: Work done by the waste pipe in 1 minute = 1/15 - (1/20 + 1/24) = - 1/40
Volume of 1/40 part = 1 gallonsVolume of whole = 1 * 40 = 40 gallons. The answer is (A).

q: If a man can cover 24 metres in one second, how many kilometres can he cover in 3 hours 45 minutes?
Options:
(A) 118 km
(B) 162 km
(C) 324 km
(D) 1887 km
(E) 177 km
a:
Stream of consciousness: 24 m/s = 24 * 18/5 kmph
3 hours 45 minutes = 3 3/4 hours = 15/4 hours
Distance = speed * time = 24 * 18/5 * 15/4 km = 324 km. The answer is (C).