Quantitative Aptitude - Arithmetic Ability Questions

In ∆ABC, ∠A = 90°, AD ⊥ BC and AD = BD = 2 cm. The length of CD is

39 is 5.2% of?

What is the value of 10% of 150% of 400?

If x = 2+32-3, then what is the value of x2+x-9 ?

If a + b = 4 and ab = 3, then what is the value of a3 + b3?

If 4x - 7y = 3 and 2x - y = 9, then x - y is.

In the following question, four number pairs are given. The number on left side of (–) is related to the number of the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

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 ?