Simplification (Railway Maths) (651 to 700)

Total Questions: 50

31. If x/ √128 = √162 / x, then find the value of 'x'. [RRB JE 23/05/2019 (Evening) ]

Correct Answer: (a) 12
Solution:

32. Simplify: [RRB JE 23/05/2019 (Evening)]

8 ÷ [(9 − 5) ÷ {(7 − 2) ÷ (3 + 9 ÷ 24)}]

Correct Answer: (a) 80/27
Solution:

33. If 1/7 of a number is subtracted from the number, the result is 30 less than the number. Find the number. [RRB JE 24/05/2019 (Evening)]

Correct Answer: (a) 210
Solution:

Let number be x According to the question,
⇒ x - x × 1/7 = x - 30
⇒ 7x - x / 7 = x - 30
⇒ 6x = 7x - 210 ⇒ x = 210
Hence the number is 210.

34. Simplify [RRB JE 24/05/2019 (Evening) ]

Correct Answer: (a) 2√15
Solution:

35. Simplify: [RRB JE 28/05/2019 (Morning) ]

Correct Answer: (a) 2
Solution:

36. If 36³ x (4096)¹/² x 144 x 9 ÷ (9³ × 72²) = 4ˣ, find the value of 'x'. [RRB JE 28/05/2019 (Afternoon) ]

Correct Answer: (a) 5
Solution:

37. Simplify: [RRB JE 31/05/2019 (Evening) ]

Correct Answer: (b) 2
Solution:

38. Simplify: [RRB JE 31/05/2019 (Evening)]

[2 × (3/2) − 3 × (2/3) ] × [ 2/5 of 3/5 of 100 ]

Correct Answer: (a) 24
Solution:

[3 - 2] × [6/25 × 100] = 24

39. Evaluate: [RRB JE 01/06/2019 (Morning)]

45 of 3/5 ÷ 1 2/7 + 3 of 1/3 − 10

Correct Answer: (d) 12
Solution:

40. Simplify: [RRB JE 01/06/2019 (Afternoon)]

0.032 × 0.2 + 0.32 × 0.002

Correct Answer: (a) 0.00704
Solution: