Puzzle 030: How Many Books?

ナゾ０３０　本は何冊？
図書館にあるだいの上にたくさんの本が
積まれている。
下画面の図は男の子と女の子、それぞれ
別の方向から見えた本お様子である。
だいの上にある本は全部で何冊あったの
だろう。

Google Translate
Many books are piled on top of the Dai in the library. Boys and girls below the figure on the screen, I saw this look from a different direction each of us. Dai will book on the book had nothing at all.

Notes on Puzzle
You are given an overhead view of a table with 5 stacks of books on them. You also have one girl who is looking at the books from one side of the table, and a boy who is looking at them from one corner of the table. You can see how many books both the girl and boy can see; from that you must figure out how many books are on the table.