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Here are the solutions to the problems from the documents you provided:

### Problem 1: Fraction of Mathematics Books that are Primary
**Question**: In a bookstore, \( \frac{2}{3} \) of the books are mathematics books, and \( \frac{3}{5} \) of the mathematics books are for primary education. What fraction of the books are primary mathematics books?

**Solution**:
\[ \text{Fraction of mathematics books that are primary} = \frac{2}{3} \times \frac{3}{5} = \frac{2 \times 3}{3 \times 5} = \frac{2}{5} \]

### Problem 2: Pages Read in 60 Minutes
**Question**: If one page of a book is read in 112 minutes, how many pages can be read in 60 minutes?

**Solution**:
Let \( x \) be the number of pages read in 60 minutes.
\[ \frac{1 \text{ page}}{112 \text{ minutes}} = \frac{x \text{ pages}}{60 \text{ minutes}} \]
\[ x = \frac{60}{112} \approx 0.54 \text{ pages} \]

### Problem 3: Number of Books for Each Subject
**Question**: In a bookstore with 400 books, \( \frac{2}{5} \) are mathematics books, and \( \frac{3}{8} \) are communication books. How many books are there for each subject?

**Solution**:
\[ \text{Mathematics books} = \frac{2}{5} \times 400 = 160 \]
\[ \text{Communication books} = \frac{3}{8} \times 400 = 150 \]
\[ \text{Other books} = 400 - (160 + 150) = 90 \]

### Problem 4: People Remaining in a Meeting
**Question**: In a meeting with 120 people, \( \frac{3}{5} \) left first, then \( \frac{5}{8} \) of the remaining people left. How many people are left in the meeting?

**Solution**:
\[ \text{People remaining after first group left} = 120 - \frac{3}{5} \times 120 = 120 - 72 = 48 \]
\[ \text{People remaining after second group left} = 48 - \frac{5}{8} \times 48 = 48 - 30 = 18 \]

### Problem 5: Multiplications of Fractions
**Question**:
\[ \frac{49}{6} \times \frac{7}{30} \times \frac{5}{14} \]

**Solution**:
\[ \frac{49}{6} \times \frac{7}{30} \times \frac{5}{14} = \frac{49 \times 7 \times 5}{6 \times 30 \times 14} = \frac{1715}{2520} = \frac{343}{504} = \frac{343}{504} = \frac{7}{14} = \frac{1}{2} \]

Please let me know if you need further details or explanations on any specific part. Here are some related questions you might find useful:

1. How do you simplify fractions?
2. What is the process to multiply fractions?
3. How do you convert improper fractions to mixed numbers?
4. What are the steps to solve a multi-step word problem?
5. How can you check your answers in fraction problems?

**Tip**: Always double-check your work for arithmetic errors, especially in multi-step problems.

Learn how to find the fraction of primary mathematics books in a bookstore with detailed step-by-step solutions. This problem involves fractions and multiplication of fractions, suitable for students in Grades 5-8.

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