Directions: The following question are accompanied by three statements (I), (II) and (III). You have to determine which statements(s) is/are sufficient/necessary to answer the following question.
The average of the first four numbers is two times of the fifth number. What is the fifth number?
I : The average of the first two numbers is 9 less than the average of the next two numbers.
II : The average of the first two numbers is 2.5 more than the fifth number.
III : The average of all five numbers is 12.6.
1
Only I
2
Only II
3
Only III
4
Either I or II and III
5
Any two of three Statements are sufficient to answer