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 on 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 cot(A/2) = x, then the value of x is

A batsman in his 12th innings makes a score of 120, and thereby increase his average by 5. The average score after 12th innings is

If 169 is subtracted from the square of a number, then the result obtained is 7056. What is the number?

20 kg of a mixture of wheat and husk contains 5% husk. How many kg more of husk must be added to make the husk content 20% in the new mixture?

The diagonal of a square is 12 cm what is the length (in cm) of its side?

The ratio between the area of a square and that of a circle, when the length of a side of the square is equal to that of the diameter of the circle, is (take π=22/7)

A's income is 25% more than B's income. B's income is what percent of A's income?