Data handling worksheet with tally marks and pictographs for analyzing book sales and coin collections.

Problem Analysis:

The task involves interpreting tally marks to determine the number of books sold for different titles and answering related questions. The tally marks are used to represent the sales data, and we need to convert these into numerical values.

#### Step 1: Understanding Tally Marks
- Tally marks are a simple way to count items.
- Each vertical line represents 1.
- After four vertical lines, the fifth mark is a diagonal line crossing the previous four, representing 5.
- This pattern repeats for higher numbers.

#### Step 2: Converting Tally Marks to Numbers
We will count the tally marks for each book title and convert them into numbers.

| Title of Books | Tally Marks | Numbers |
|----------------------|----------------------|---------|
| Enid Blyton I | |||| |||| |||| |||| | 20 |
| Enid Blyton II | |||| |||| |||| || | 18 |
| Famous Five I | |||| |||| |||| |||| | 20 |
| Famous Five II | |||| |||| |||| |||| | 20 |
| Famous Five III | |||| |||| |||| || | 18 |
| Enid Blyton III | |||| | 4 |

#### Step 3: Answering the Questions
Now, we use the converted numbers to answer the given questions.

---

Question a: What is the total number of books sold during the month?

To find the total, sum the numbers in the "Numbers" column:

\[
20 + 18 + 20 + 20 + 18 + 4 = 100
\]

Answer: The total number of books sold during the month is 100.

---

Question b: Which book is the most popular one?

The most popular book is the one with the highest number of sales. From the table:

- Enid Blyton I: 20
- Enid Blyton II: 18
- Famous Five I: 20
- Famous Five II: 20
- Famous Five III: 18
- Enid Blyton III: 4

The books with the highest sales are Enid Blyton I, Famous Five I, and Famous Five II, each with 20 sales.

Answer: The most popular books are Enid Blyton I, Famous Five I, and Famous Five II.

---

Question c: How many books of Enid Blyton I were sold?

From the table, the number of books sold for Enid Blyton I is 20.

Answer: 20 books of Enid Blyton I were sold.

---

Question d: Name the two titles of which an equal number of books were sold.

We need to identify titles with the same number of sales:

- Enid Blyton I: 20
- Enid Blyton II: 18
- Famous Five I: 20
- Famous Five II: 20
- Famous Five III: 18
- Enid Blyton III: 4

The pairs with equal sales are:
- Enid Blyton II and Famous Five III (both sold 18 books)
- Enid Blyton I, Famous Five I, and Famous Five II (all sold 20 books)

Since the question asks for two titles, we can choose any pair from the above. For example:

Answer: Enid Blyton II and Famous Five III.

---

Question e: What is the total sale of Famous Five II?

From the table, the number of books sold for Famous Five II is 20.

Answer: The total sale of Famous Five II is 20.

---

Question f: Which book was sold the least?

From the table, the book with the lowest number of sales is Enid Blyton III, with 4 sales.

Answer: Enid Blyton III was sold the least.

---

Final Answers:

\[
\boxed{
\begin{array}{l}
\text{a. } 100 \\
\text{b. } \text{Enid Blyton I, Famous Five I, Famous Five II} \\
\text{c. } 20 \\
\text{d. } \text{Enid Blyton II and Famous Five III} \\
\text{e. } 20 \\
\text{f. } \text{Enid Blyton III}
\end{array}
}
\]