The pictogram shows information about the number of books sold in a bookshop during January, February, and March.
| Month | Pictogram |
|---|---|
| January | 2 full rectangles |
| February | 2 full rectangles |
| March | 2 full rectangles and 1 small rectangle |
| April |
Key: 1 full rectangle represents 12 books.
Write down the number of books sold in March.
15 books were sold in April. Show this information on the pictogram.
What was the total number of books sold in these four months?