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.

Simplify 11.9983 = ?

The product of two numbers is 0.432. One of the numbers is 1.6. What is the other number?

The average of ten numbers is 18. If one number is removed, then the average becomes 16, then what is the removed number?

The average revenues of 13 consecutive years of a company is Rs 78 lakhs. If the average of first 7 years is Rs 73 lakhs and that of last 7 years is Rs 85 lakhs, what is the revenue for the 7th year?

The difference between simple and compound interests compounded annually on a certain sum of money for 2 years at 16% per annum is Rs 320. What is the value of given sum (in Rs)?

The least number that must be substracted from 63520 to make the result a perfect square is

If a perfect square, not divisible by 6, be divided by 6, the remainder will be