Books on shelf

Algebra Level 1

There are several books on a bookshelf. If one book is the 6th from the left and 4th from the right, then how many books are on the shelf?

10 11 Not enough information to determine answer 9

View wiki
Jeby Oommen by Jeby Oommen , 36, India

This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try refreshing the page, (b) enabling javascript if it is disabled on your browser and, finally, (c) loading the non-javascript version of this page . We're sorry about the hassle.

3 solutions

Sadasiva Panicker
Nov 24, 2015

1,2,3,4,5,'6'.3.2.1: Therefore, the total number of books is 9.

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Pranjal Prashant
Nov 19, 2015

Total number of books = rank of book from left + rank of book from right -1

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Steve Ives
Nov 24, 2015

If an item is the 'n'th from the left in a rank, then there are n-1 items to its left. Similarly for the right. So in a rank with one item which is 6th from the left and 4th from the right there must be (6-1) items to one side and (4-1) items to the other side plus the item itself i.e. (6-1) + (4-1) + 1 = 5+3+1 = 9.

0 Helpful 0 Interesting 0 Brilliant 0 Confused

0 pending reports

×

Problem Loading...

Note Loading...

Set Loading...