Quantitative Aptitude - Arithmetic Ability Questions

In the following question, four groups of three numbers are given. In each group the second and third number are related to the first number by a Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

Find the odd word/number/letters from the given alternatives

Select the odd word/letters/number/number pair from the given alternatives.

Three triangles are marked out of a bigger triangle at the three vertices such that each side of each of the smaller triangles is one-fourth as long as each corresponding side of the bigger triangle. The ratio of the area of the three small triangles taken together to that of the rest of the bigger triangle is

If P : Q : R = 6 : 7 : 8 and R : S = 3 : 5, then what is P : S?

What is the simplest form of (1 + cosA)(cosecA ­ cotA)?

If x - 2y = 2 and 3x + y = 20, then the value of (x,y) is

If 1+y16-74, then the value of 5y-15