Quantitative Aptitude - Arithmetic Ability Questions

Sum of three consecutive integers is 51 . The middle one is:

The distance between the points (2, 7) and (k, -5) is 13. What is the value of k?

X and Y give an exam. Difference of their marks is 45 and the difference of their marks is 15% of the maximum marks. What is the maximum marks for the exam?

A, B and C are three points on a circle with centre O. The tangent at C meets BA produced at T. If ∠ATC = 30° and ∠ACT = 48°,then what is the value of ∠AOB ?

If x1/4 + x-1/4 = 2, then what is the value of x81 + (1/x81)?

Two numbers are in the ratio 2:5 and their HCF is 18. Their LCM is

If sinA + sin2A = 1 then what is the value of cos2A + cos4A ?

If x, y, z are the three factors of a3 -7a - 6, then value of x+y+z will be