Algebra (Railway Maths) (Part – VII)

Total Questions: 50

21. Find the value of x in the given equation. √2401 / x = x / 6.25 [RRB NTPC 29/01/2021 (Evening)]

Correct Answer: (b) 17.5
Solution:

22. If a + b + c = 0, then find the value of (a² + b² + c²)² / (a²b² + b²c² + c²a²) [RRB NTPC 30/01/2021 (Morning)]

Correct Answer: (d) 4
Solution:

23. If (2√2 + √7) / (2√2 − √7) = x + y√14, find the value of y. [RRB NTPC 30/01/2021 (Morning)]

Correct Answer: (a) 4
Solution:

24. If a¹/³ = 6, then find the value of a² − 36a. [RRB NTPC 30/01/2021 (Evening)]

Correct Answer: (b) 38880
Solution:

25. If x = 7 + 4√3 then find value of √x + 1/√x

Correct Answer: (d) 4
Solution:

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

Correct Answer: (b) 9/25 or 16/25
Solution:

27. If x + y + z = 0, then what will be the value of x²/yz + y²/zx + z²/xy ? [RRB NTPC 02/02/2021 (Morning) ]

Correct Answer: (b) 3
Solution:

28. Solve the following: [RRB NTPC 02/02/2021 (Morning)]

Correct Answer: (d) (x + 4)/x
Solution:

29. If the sum of three numbers is zero, then which of the options below will always be equal to the value of the sum of the cubes of those numbers? [RRB NTPC 02/02/2021 (Evening)]

Correct Answer: (b) Three times the product of the three numbers
Solution:

If a + b + c = 0
Then a³ + b³ + c³ = 3abc

30. The pair of equations 2ˣ ⁺ ʸ = 16 and 64ˣ ⁻ ʸ = 2 has: [RRB NTPC 03/02/2021 (Morning)]

Correct Answer: (d) Unique solution x = 25/12, y = 23/12
Solution: