Question

1. Seven books are placed one above the other in a particular way.
2. History book is placed exactly above Civics book.
3. Geography book is fourth from the bottom and English book is fifth from the top.
4. There are two books in between Civics and Economics books.

How many books are there between Civics and Science books?
To answer this question, which other extra information is required, if any, from the following?

• A. There are two books between Geography and Science books.
• B. There are two books between Mathematics and Geography books.
• C. There is one book between English and Science books.
• D. The Civics book is before two books above Economics book.
• E. No other information is required.

Answer 1

The correct option is C There is one book between English and Science books.

Since it is given that the History book is exactly above Civics, Geography is fourth from the bottom, English is fifth from the top and there are two books between Civics and Economics. Also there are 2 books between Civics and Economics.

So, we have the sequence in the order

--------- History Civics Geography English Economics ---------

Then to determine the number of books available between Civics and Science, only one extra information we need and that is option C.

Which means Civics is the at the bottom of the pile.

Hence C is required to answer this question.