Ques: 90 is increased by 50%. Find the final number.
Options:
(A) 100
(B) 110
(C) 135
(D) 140
(E) 160
Ans: (C)
CoT: Final number = Initial number + 50%(original number) = 90 + 50%(90) = 90 + 45 = 135.

Ques: 252 can be expressed as a product of primes as :
Options:
(A) 2 x 2 x 3 x 3 x 7
(B) 2 x 2 x 2 x 3 x 7
(C) 3 x 3 x 3 x 3 x 7
(D) 2 x 3 x 3 x 3 x 7
(E) 2 x 3 x 7 x 3 x 2
Ans: (A)
CoT: 252 = 2 x 2 x 3 x 3 x 7.

Ques: Look at this series: 2, 4, 6, 8, 10, ... What number should come next?
Options:
(A) 11
(B) 12
(C) 14
(D) 15
(E) 16
Ans: (B)
CoT: This is a simple addition series. Each number increases by 2.

Ques: An design manager has 10patterns of chairs & 7patterns of tables. In how many ways can he make a pair of table & chair?
Options:
(A) 70
(B) 40
(C) 80
(D) 90
(E) 100
Ans: (A)
CoT: 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 7 ways
Hence one chair and one table can be arranged in 10 x 7 ways = 70 ways