question: In an office, 30 percent of the workers have at least 5 years of service, and a total of 16 workers have at least 10 years of service. If 90 percent of the workers have fewer than 10 years of service, how many of the workers have at least 5 but fewer than 10 years of service?
Options:
(A) 480
(B) 48
(C) 50
(D) 144
(E) 160
answer: Stream of consciousness: (10/100)Workers = 16 = > number of workers = 160
(30/100)*Workers = x+16 = > x = 48 The answer is (B).

q: 10 books are placed at random in a shelf. The probability that a pair of books will always be together is ?
Options:
(A) 1/9
(B) 1/6
(C) 1/5
(D) 1/0
(E) 1/1
a: Stream of consciousness: 10 books can be rearranged in 10! ways consider the two books taken as a pair then number of favourable ways of getting these two books together is 9! 2!
Required probability = 1/5 The answer is (C).

question: The average of first six prime numbers greater than 20 is?
Options:
(A) 10
(B) 20
(C) 30
(D) 40
(E) 34
answer: Stream of consciousness: 23 + 29 + 31 + 37 + 41 + 43 = 204/6 = 34 The answer is (E).

q: A car finishes a journey in nine hours at the speed of 80 km/hr. If the same distance is to be covered in six hours how much more speed does the car have to gain?
Options:
(A) 8 km/hr
(B) 40 km/hr
(C) 12 km/hr
(D) 16 km/hr
(E) None of these
a: Stream of consciousness: Distance covered by the car = 80 9 = 720 km
\ Speed = 7206 = 120 km/hr
\ Speed gain = 120 80 = 40 km/hr The answer is (B).

question: Look at this series: 53, 53, 40, 40, 27, 27, ... What number should come next?
Options:
(A) 12
(B) 14
(C) 27
(D) 53
(E) 86
answer: Stream of consciousness: In this series, each number is repeated, then 13 is subtracted to arrive at the next number. The answer is (B).

question: Two persons A and B can complete a piece of work in 40 days and 60 days respectively. If they work together, what part of the work will be completed in 6 days?
Options:
(A) 1/8
(B) 1/3
(C) 1/6
(D) 1/2
(E) 1/4
answer:
Stream of consciousness: A's one day's work = 1/40
B's one day's work = 1/60
(A + B)'s one day's work = 1/40 + 1/60 = 1/24
The part of the work completed in 6 days = 6 (1/24) = 1/4. The answer is (E).