question: (4300731)-! = 2535618. Find value of !?
Options:
(A) 1213441
(B) 2354546
(C) 4354556
(D) 2435454
(E) 1765113
answer: Stream of consciousness: Let 4300731 - ! = 2535618
Then !, = 4300731 - 2535618 = 1765113 The answer is (E).

q: A pipe can fill a cistern in 12 minutes whereas the cistern when fill can be emptied by a leak in 18 minutes. When both pipes are opened, find when the cistern will be full?
Options:
(A) 17
(B) 16
(C) 70
(D) 36
(E) 12
a: Stream of consciousness: 1/12 - 1/18 = 1/36
36 minutes The answer is (D).

question: The speed of a boat in still water is 50kmph and the speed of the current is 20kmph. Find the speed and upstream?
Options:
(A) 30 kmph
(B) 40 kmph
(C) 78 kmph
(D) 15 kmph
(E) 23 kmph
answer: Stream of consciousness: Speed downstream = 50 + 20 = 70 kmph
Speed upstream = 50 - 20 = 30 kmph The answer is (A).

q: In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much? Look at this series: 120, 30, 240, 25, ___, 20, 480, 15... Which number is missing?
Options:
(A) 120
(B) 360
(C) 340
(D) 960
(E) 280
a: Stream of consciousness: B 360
This is an alternating addition and subtraction series. In the first pattern, 120 is added to each number to arrive at the next. In the second, 5 is subtracted from each number to arrive at the next. The answer is (B).

question: Calculate the circumference of a circular field whose radius is 10 centimeters.
Options:
(A) 20 cm
(B) 19 cm
(C) 28 cm
(D) 25 cm
(E) 30 cm
answer: Stream of consciousness: Circumference C is given by
C = 2r = 2*10 = 20 cm The answer is (A).

question: Pipes A and B can fill a cistern in 8 and 24 minutes respectively. They are opened an alternate minutes. Find how many minutes, the cistern shall be full?
Options:
(A) 12 min
(B) 6 min
(C) 4 min
(D) 8 min
(E) 10 min
answer:
Stream of consciousness: 1/8 + 1/24 = 1/6
6 * 2 = 12 The answer is (A).