(Study Material) RRB NTPC (Tier -2) Exam (Numerical Aptitude) - Simplification

(Study Material) RRB NTPC (Tier -2) Exam (Numerical Aptitude) - Simplification

1. Given that 9/2x + 3y = 21 and 1/2x – 8y = 4. Find the value of 12x – 12y.

(a) 12
(b) 30
(c) 25
(d) 60

2. Let A = (x + 1)/(x – 1) and B = (x – 1)/(x + 1). Determine the value of A – B.

(a) 0
(b) x/(x² –1)
(c) 4x/(x² – 1)
(d) None of these

3. If the numerator of a fraction is double and the denominator is increased by 3, the new fraction is 3/5. What is the original fraction, if its denominator is more than twice the numerator by 1?

(a) 3/7
(b) 6/13
(c) 1/3
(d) 5/11

4. For what value of x, 8 + (x – 3)² have the least value?

(a) – 3
(b) 0
(c) 3
(d) 5

5. 3.7 (10)⁷ is equal to

(a) 370000
(b) 3700000
(c) 37000000
(d) 370000000

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