[Ques]: If f(x)=1/x and x is a natural number, what CANNOT be the answer for f(f(x))?
Options:
(A) 1/7
(B) 3
(C) 12/3
(D) 6/6
(E) 1
*Ans*: (A)
--CoT--: Answer A is impossible because the invers of 1/x is x, and the only way to have something other than a natural number is to input something other than a natural number. With the specification that only natural numbers may be used 1/7 is not a possibility for f(f(x))

[Ques]: What should come in place of the question mark (?) in the following equation?
5679 + 1438 2015 = ?
Options:
(A) 5192
(B) 5012
(C) 5102
(D) 5002
(E) None of these
*Ans*: (C)
--CoT--: ? = 5679 + 1438 2015 = 5102

[Ques]: A train 100 meters long completely crosses a 300 meters long bridge in 45 seconds. What is the speed of the train is?
Options:
(A) 32
(B) 28
(C) 299
(D) 277
(E) 21
*Ans*: (A)
--CoT--: S = (100 + 300)/45 = 400/45 * 18/5 = 32

[Ques]: How much is 80% of 40 is greater than 4/5 of 25?
Options:
(A) 22
(B) 67
(C) 88
(D) 12
(E) 66
*Ans*: (D)
--CoT--: (80/100) * 40 (4/5) * 25
32 - 20 = 12