q: An design manager has 10patterns of chairs & 10patterns of tables. In how many ways can he make a pair of table & chair?
Options:
(A) 20
(B) 40
(C) 80
(D) 90
(E) 100
a: Stream of consciousness: He has has ten patterns of chairs and eight patterns of tables
Hence, A chair can be arranged in 10 ways and
A table can be arranged in 10 ways
Hence one chair and one table can be arranged in 10 x 10 ways = 100 ways The answer is (E).

question: How many three digit numbers that do not contain the digit 2 are there?
Options:
(A) 100
(B) 200
(C) 512
(D) 648
(E) 729
answer: Stream of consciousness: 8*9*9 = 648: 8 options for the first digit (no 0, no 2) and 9 options for each of the remaining digits (no 2 there). The answer is (D).

q: The speed of a boat in still water is 90kmph and the speed of the current is 20kmph. Find the speed downstream and upstream?
Options:
(A) 40, 68 kmph
(B) 110, 70 kmph
(C) 90, 60 kmph
(D) 40, 60 kmph
(E) 20, 60 kmph
a: Stream of consciousness: Speed downstream = 90 + 20 = 110 kmph
Speed upstream = 90 - 20 = 70 kmph The answer is (B).

question: Which one of the following is a prime number?
Options:
(A) 10
(B) 61
(C) 49
(D) 75
(E) 91
answer: Stream of consciousness: 61 is divisible by 1, and itself. So, it is a prime number. The answer is (B).

q: Find the simple interest on Rs.500 for 9 months at 6 paisa per month?
Options:
(A) 277
(B) 270
(C) 288
(D) 266
(E) 121
a: Stream of consciousness: I = (500*9*6)/100 = 270 The answer is (B).

q: Find the wrong number below mentioned series
5,24,60,120,210,340
Options:
(A) 340
(B) 210
(C) 5
(D) 60
(E) none
a:
Stream of consciousness: 5 is the only prime number or odd number in the series. The answer is (C).