Simplification (Railway Maths) (451 to 500)

Total Questions: 50

21. What is the sum of 5/2 and 2/5? [RRB NTPC 31/01/2021 (Morning)]

Correct Answer: (d) 29/10
Solution:

Sum of 5/2 and 2/5 = 5/2 + 2/5 = 29/10

22. Find √(1521/1849) [RRB NTPC 01/02/2021 (Morning)]

Correct Answer: (b) 39/43
Solution:

23. What will the value of the following expression be? [RRB NTPC 01/02/2021 (Evening)]

(6 + 3) / 3 - 5 × (4 + 5)

Correct Answer: (b) -42
Solution:

(6 + 3 / 3) - 5 × (4 + 5)
= 9/3 - 5 × 9 = 3 - 45 = - 42

24. What is the value of (4 + √2) / (√2 + 1)? [RRB NTPC 01/02/2021 (Evening)]

Correct Answer: (b) 3√2 − 2
Solution:

25. What is the sum of 1/3, 4/3 and 3/4? [RRB NTPC 01/02/2021 (Evening)]

Correct Answer: (b) 29/12
Solution:

1/3 + 4/3 + 3/4 = 4 + 16 + 9/12
= 29/12

26. If √2916 = 54 then what is the value of the following? [RRB NTPC 01/02/2021 (Evening) ]

√29.16 + √0.2916 + √0.002916 + √0.00002916

Correct Answer: (b) 5.9994
Solution:

27. What will the value of the following expression be? [RRB NTPC 01/02/2021 (Evening)]

20 - [15 - {4 - (8 - 6 + 3)}]

Correct Answer: (b) 4
Solution:

20 − [15 − {4 − (8 − 6 + 3)}]
= 20 − [15 − {4 − 5}]
= 20 − [15 + 1]
= 20 − 16
= 4

28. What is the value of the following equation? [RRB NTPC 02/02/2021 (Morning)]

√225/14 × √196/22 × √484/15

Correct Answer: (b) 1
Solution:

(√225 / 14) × (√196 / 22) × (√484 / 15)
= (15 / 14) × (14 / 22) × (22 / 15)
= 1

29. What is the value of the following expression? [RRB NTPC 02/02/2021 (Morning)]

103 - [144 ÷ (12 × 12) + 5 + 12 ÷ (6 - 2) + 10]

Correct Answer: (d) 84
Solution:

103 − [144 ÷ (12 × 12) + 5 + 12 ÷ (6 − 2) + 10]
= 103 − [144 ÷ 144 + 5 + 12 ÷ 4 + 10]
= 103 − [1 + 5 + 3 + 10]
= 103 − 19
= 84

30. Solve the following equation? [RRB NTPC 02/02/2021 (Morning) ]

Correct Answer: (b) 5
Solution: