Question

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Explanation:

Sub - question 2 (about the number of books)

Step 1: Determine the number of books in each group

Looking at the figure, each group of books has 4 books.

Step 2: Determine the number of groups

There are 4 groups of books.

Step 3: Calculate the total number of books

To find the total number of books, we use the multiplication operation. The formula is \( \text{Total number of books}=\text{Number of books per group}\times\text{Number of groups} \). Substituting the values, we get \( 4\times4 = 16 \).

Step 1: Determine the denomination of each bill

Looking at the figure, each bill is a 10 - dollar bill.

Step 2: Determine the number of bills

There are 2 bills.

Step 3: Calculate the total number of dollars

To find the total number of dollars, we use the multiplication operation. The formula is \( \text{Total number of dollars}=\text{Denomination of each bill}\times\text{Number of bills} \). Substituting the values, we get \( 10\times2=20 \).

Answer:

There are 16 books.

Sub - question 4 (about the number of dollars)