Someone left a ton of books on the table, and now these two librarians have the unpleasant task of shelving them all again. The librarians are trying to count all the books, but they're stacked so high that neither one can see them all.
Using each librarian's point of view, work out how many books are on the table.
UK Version
Someone left the library desk covered with books and left these poor librarians with the task of shelving them all again. The librarians are trying to count all the books, but they're stacked so high that neither one can see them all.
Using each librarian's point of view, work out how many books are on the table.
Hints
Click a Tab to reveal the Hint.
US Version
Make a note of all the books you see using the Memo function. For example, take a look at how many books each librarian can see from her viewpoint.
That can help you determine how many books are in the center pile.
UK Version
Use the Memo Function to make a note of the number of books in each pile.
For example, you can work out how many books are in the centre pile using the girl's viewpoint.
US Version
Next, let's figure out how many books are in the lower-left corner of the table. Can you see which stack that is from the other librarian's perspective?
UK Version
You can work out how many books are in the bottom-left corner of the table using the boy's viewpoint.
US Version
You can also work out the number of books stacked in the top-right corner from the viewpoint of the librarian at the bottom of the screen.
That leaves only two piles of books to figure out!
UK Version
You can work out how many books are stacked in the top-right corner using the boy's viewpoint. If you've used the information in the previous two hints, there should only be two piles of books left.
US Version
The books in the top left corner can be counted using the top librarian's viewpoint. Don't forget that from her point of view, the stack is on the right.
You already know that the bottom-left corner contains only two books, so the three books that she sees must be in the top-left corner.
UK Version
The books in the top-left corner can be counted using the girl's viewpoint.
Bear in mind that from her point of view, that stack is on the right. You already know that the bottom-left corner contains only two books, so the three books that the girl can see on her right belong to the stack in the top-left corner.
Solution
Incorrect
US Version
Too bad!
Try looking at the problem from both angles, and figure out where each stack of books is.