q: Some persons can do a piece of work in 16 days. Two times the number of these people will do half of that work in?
Options:
(A) 3
(B) 4
(C) 5
(D) 6
(E) 8
a: OK... 16/ (2 * 2) = 4 days
The answer is (B).

q: The product of face value of 3 and local value of 6 in the numeral 78934064 is
Options:
(A) 18
(B) 24
(C) 180
(D) 240
(E) 108
a: OK... (Face value of 3) x (Local value of 6) = (3 x 60) = 180
The answer is (C).

q: Which of the options is a two-digit number, which has a unit's digit that exceeds its ten's digit by 3 and the product of the given number and the sum of its digits is equal to 175.
Options:
(A) 25
(B) 36
(C) 47
(D) 52
(E) 63
a:
OK... Using the elimination method the option that fits this description is 25
5-2 = 3 (unit's digit that exceeds its ten's digit by 3)
25*7 = 175 (the product of the given number and the sum of its digits is equal to 175)
The answer is (A).