Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the missing number from the given series.34, 69, 140, 283, ?, 1145

If a2+1=9a, (a≠0) then the value of a2+1a2 is

In a triangle ABC, OB and OC are the bisectors of angles ∠ B and ∠C respectively. ∠BAC = 60°. Then the angle ∠BOC will be

A discount of 45% on an article is equal to the discount of 65% on other article. What is the respective ratio of the marked price of both the articles?

In the following question, select the odd word from the given alternatives.

∆XYZ is right angled at Y. If tanX = 15/8, then what is the value of sinZ ?

What is the value of S = 11x3x5 + 11x4 + 13x5x7 + 14x7 + 15x7x9 + 17x10 + ... upto 20 terms. Then what is the value of S? 

If (cotAcotB - 1) / (cotB + cotA) = x, then the value of x is