question: If 1/2 of the air in a tank is removed with each stroke of a vacuum pump, what fraction of the original amount of air has been removed after 2 strokes ?
Options:
(A) 3/4
(B) 7/8
(C) 1/4
(D) 1/8
(E) 1/16
answer: Stream of consciousness: Left After 1st stroke = 1/2
Left After 2nd stroke = 1/2 * 1/2 = 1/4
So removed = 1- 1/4 = 3/4 The answer is (A).

q: What approximate value should come in place of question mark (?) in the following equation
287.532 + 1894.029 657.48 = 843.095 + ?
Options:
(A) 870
(B) 790
(C) 680
(D) 770
(E) 890
a: Stream of consciousness: ? = 285 + 1895 655 845 or, ? = 680 The answer is (C).

question: What will come in place of the x in the following number series? 12, 26, 54, 110, 222, x
Options:
(A) 444
(B) 446
(C) 448
(D) 452
(E) 454
answer: Stream of consciousness: 12
12 2 + 2 = 26
26 2 + 2 = 54
54 2 + 2 = 110
110 2 + 2 = 222
222 2 + 2 = 446 The answer is (B).

q: What is the next number of the following sequence.
8, 8, 6, 2,.... ?
Options:
(A) -4
(B) -5
(C) -6
(D) -7
(E) -8
a: Stream of consciousness: 8-(2*0) = 8
8-(2*1) = 6
6-(2*2) = 2
2-(2*3) = -4 The answer is (A).

question: If a man can cover 18 metres in one second, how many kilometres can he cover in 3 hours 45 minutes?
Options:
(A) 243 km
(B) 162 km
(C) 1767 km
(D) 1887 km
(E) 177 km
answer: Stream of consciousness: 18 m/s = 18 * 18/5 kmph
3 hours 45 minutes = 3 3/4 hours = 15/4 hours
Distance = speed * time = 18 * 18/5 * 15/4 km = 243 km. The answer is (A).

question: A no. when divided by the sum of 555 and 445 gives 2times their difference as quotient & 30 as remainder. Find the no. is?
Options:
(A) 124432
(B) 145366
(C) 157768
(D) 178432
(E) 220030
answer:
Stream of consciousness: (555 + 445) * 2 * 110 + 30 = 220000 + 30 = 220030 The answer is (E).