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 .

Four pairs of words are given. Find the odd one out.

If 3a+4b3c+4d = 3a-4b3c-4d, then 

If the side of a square is increased by 20%, then what will be the percentage increase in its perimeter?

What is the reflection of the point (3,-5) in the origin?

What is the slope of the line 2x - 5y = 12?

Cost price of a watch is Rs 530. If the loss percentage is 24%, then what is the value (in Rs) of loss?

What is the ratio of simple interest earned on certain amount at the rate of 12% for 6 years and that for 12 years?