Quantitative Aptitude - Arithmetic Ability Questions

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.

If (x/y)a-4 = (y/x)2a-5, then what is the relation between x and y?

Marked price of an article is Rs 3600 and selling price is Rs 3132. What is the discount percentage?

Sum of twice a fraction and 3 times its reciprocal is 29/3. What is the fraction?

A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?

A complete factorisation of x4 + 64 is

Let A(O,-1), B(0,3) and C(2,1) be three points. Let   △1 be the area of the triangle ABC and △2 be the area of the triangle formed by the mid points of the sides of the triangle whose vertices are A, B and C such that △1=1 ,△2=x Find the value of x .

The point of intersection of all the three medians of a triangle is called its