There were 240 eggs in the store.  156 eggs were sold.  How many egg were left?  BONUS: How many dozen eggs is that?

Katie decided to read a book that was 649 pages long.  She has already read 495 pages of the book.  How many more pages does she need to read to finish the whole book?

There were 356 animals at the SPCA.  Some of them were healthy.  Some of them needed medicine.  172 of them were being given medicine so they would be healthy for adoption.   The rest of the animals were already healthy and ready to be adopted.  How many of the animals were healthy and ready for adoption?