Aptitude 2)If pq = 28 where p and q (p > q) are whole numbers then which of the following can be (p 2 – q 2 )? a)32 b)83 c)783 d)63 Ans. p and q can be written in the pairs of (28,1) or (7,4) or (14,2) We have 14 2 – 2 2 = 196 – 4 = 192 Also, 7 2 – 4 2 = 49 – 16 = 33 Also, 28 2 – 1 2 = 784 – 1 = 783 Hence, p 2 – q 2 = 783
Aptitude 1) A person has to make 146 pieces of a long bar. He takes 4 seconds to cut a piece. What is the total time taken by him in seconds to make 146 pieces? a)584 b)580 c)730 d)725 Ans . To make 146 pieces there are 145 cuts required Each cut takes 4 seconds. Hence the person will require 145 × 4 = 580 seconds.