q: There are 20 balls in a jar. You take out 2 blue balls without putting them back inside, and now the probability of pulling out a blue ball is 1/5. How many blue balls were there in the beginning?
Options:
(A) 12.
(B) 9.
(C) 8.
(D) 7.
(E) 6.
a: Stream of consciousness: 12 = 3 blue balls + 18 / 2 The answer is (A).

question: A car finishes a journey in ten hours at the speed of 65 km/hr. If the same distance is to be covered in five hours how much more speed does the car have to gain?
Options:
(A) 8 km/hr
(B) 10 km/hr
(C) 65 km/hr
(D) 16 km/hr
(E) None of these
answer: Stream of consciousness: Distance covered by the car = 65 10 = 650 km
\ Speed = 6505 = 130 km/hr
\ Speed gain = 130 65 = 65 km/hr The answer is (C).

q: Two trains are moving at 60 kmph and 70 kmph in opposite directions. Their lengths are 150 m and 100 m respectively. The time they will take to pass each other completely is?
Options:
(A) 5 sec
(B) 6 sec
(C) 7 sec
(D) 8 sec
(E) 9 sec
a: Stream of consciousness: 70 + 60 = 130 * 5/18 = 325/9 mps
D = 150 + 100 = 250 m
T = 250 * 9/325 = 7 se The answer is (C).

question: If X and Y are both positive two-digit integers and share no digits, and X > Y, what is the smallest possible value of X - Y?
Options:
(A) 0
(B) 1
(C) 2
(D) 3
(E) 9
answer: Stream of consciousness: Answer = B = 1
20 - 19 = 30-29 = 40-39 = 50-49 = 1 The answer is (B).

q: The average salary of workers in an industry is Rs.200 the average salary of technicians being Rs.400 and that of non-technicians being Rs.125. What is the total number of workers?
Options:
(A) 277
(B) 665
(C) 662
(D) 552
(E) 281
a: Stream of consciousness: 8 * 84 = 672 7 = 665 The answer is (B).

q: A train 360 meters long is running with a speed of 54 kmph. The time taken by it to cross a tunnel 120 meters long is?
Options:
(A) 29
(B) 18
(C) 48
(D) 99
(E) 32
a:
Stream of consciousness: D = 360 + 120 = 480
S = 54 * 5/18 = 15 mps
T = 480/15 = 32 sec The answer is (E).