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.

Which of the following points lies on the line 3x -­ 4y = ­-13?

If Cosecθ + Cotθ = 2, then Cotθ = ?

If two complimentary angles are in the ratio of 11 : 7, find the smaller angle.

R is 80% more efficient than S. If S alone can make a book in 90 days, then R alone can make the book in how many days?

What is the effective discount (in %) on two successive discounts of 20% and 10%?

The lengths of two parallel sides of a trapezium are 21 cm and 9 cm. If its height is 10 cm, then what is the area (in cm2) of the trapezium?

The length of the two adjacent sides of a rectangle inscribed in a circle are 5 cm and 12 cm respectively. Then the radius of the circle will be