Simplification (Railway Maths) (451 to 500)

Total Questions: 50

31. Find the answer of given equation? [RRB NTPC 02/02/2021 (Morning) ]

Correct Answer: (c) 5
Solution:

32. The value of √0.04 + √1.44 + √1.69 + √0.0009 is: [RRB NTPC 02/02/2021 (Morning)]

Correct Answer: (b) 2.73
Solution:

√0.04 + √1.44 + √1.69 + √0.0009
= 0.2 + 1.2 + 1.3 + 0.03
= 2.73

33. If the value of 1/36.18 is 0.0276, then what is the value of 1/0.0003618? [RRB NTPC 02/02/2021 (Evening)]

Correct Answer: (a) 2760
Solution:

34. What is the value of [RRB NTPC 02/02/2021 (Evening)]

7/9 − 11/12 + 13/16 − 1/8 = ?

Correct Answer: (a) 79/144
Solution:

7/9 − 11/12 + 13/16 − 1/8
= (112 − 132 + 117 − 18) / 144
= 79 / 144

35. What is the value of (6 × 2) / (8 − 1 + 5)? [RRB NTPC 02/02/2021 (Evening)]

Correct Answer: (a) 1
Solution:

(6 × 2) / (8 − 1 + 5)
= 12 / 12
= 1

36. What will be the value of the following expression? [RRB NTPC 03/02/2021 (Evening)]

0.25 ÷ 0.0025 × 0.025 × 25

Correct Answer: (b) 62.5
Solution:

0.25 ÷ 0.0025 × 0.025 × 25
= 25/100 × 10000/25 × 25/1000 × 25
= 62.5

37. Find the quotient of 0.5 ÷ 0.71 (correct to 3 decimal places). [RRB NTPC 03/02/2021 (Evening)]

Correct Answer: (c) 0.704
Solution:

When we divide, we get quotient = 0.704

38. Which fraction bears the same ratio to 1/27 as 3/11 does to 5/9? [RRB NTPC 03/02/2021 (Evening)]

Correct Answer: (d) 1/55
Solution:

Let the required fraction = x / y
A/Q,
x/y × 27/1 = 3/11 × 9/5
⇒ 27x / y = 27/55 ⇒ x/y = 1/55

39. What is the value of (√5 + 1) / (√5 − 1)? [RRB NTPC 03/02/2021 (Evening)]

Correct Answer: (d) (3 + √5) / 2
Solution:

40. Which of the following options gives the value of 1999² − 999²? [RRB NTPC 03/02/2021 (Evening) ]

Correct Answer: (c) 2998000
Solution:

1999² - 999² = (1999 + 999)
(1999 - 999) = 2998 × 1000 = 2998000