Quantitative Aptitude - Arithmetic Ability Questions

If x2-3x+1=0, then x+1x is (x≠0)

If x = 1 + √2 + √3 , then the value of 2x4 - 8x3 - 5x2 + 26x - 28 is

The sum of three numbers is 252. If the first number is thrice the second and third number is two-third of the first, then the second number is

An object travels 24 m in 3 s and then another 15 m in 2 s. What is the average speed of the object?

The distance between the points (4, 8) and (k,-4) is 13. What is the value of k?

The distance between the tops of two building 38 metres and 58 metres high is 52 metres. What will be the distance (in metres) between two buildings?

The mean of 12 observations is 15. One more observation is included and the new mean becomes 16. The 13th observation is

If the average age of four children is 12 years and the average age of these children and their fathers is 20 years, what is the age of the father?