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The image contains two mathematical questions. Let me break them down:

**(a)** Find the percentage of numbers which are multiples of 3 from the set \( \{1, 2, 3, 4, 5, \dots, 9\} \).

**(b)** Arrange the following fractions in descending order:  
\( \frac{1}{2}, \frac{2}{3}, \frac{3}{4}, \frac{5}{7}, \frac{2}{5} \).

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### (a) **Finding the percentage of multiples of 3**

The set of numbers given is \( \{1, 2, 3, 4, 5, 6, 7, 8, 9\} \).

Multiples of 3 in this set: \( 3, 6, 9 \).

- Total numbers in the set: 9
- Multiples of 3: 3 numbers

To find the percentage:
\[
\text{Percentage} = \left( \frac{3}{9} \right) \times 100 = 33.33\%
\]

So, **33.33%** of the numbers are multiples of 3.

---

### (b) **Arranging fractions in descending order**

We have the following fractions to arrange:
\[
\frac{1}{2}, \frac{2}{3}, \frac{3}{4}, \frac{5}{7}, \frac{2}{5}
\]

To compare them, we can convert them to decimal form:
- \( \frac{1}{2} = 0.5 \)
- \( \frac{2}{3} \approx 0.6667 \)
- \( \frac{3}{4} = 0.75 \)
- \( \frac{5}{7} \approx 0.7143 \)
- \( \frac{2}{5} = 0.4 \)

Now, in descending order (from largest to smallest):
\[
\frac{3}{4} \, (0.75), \, \frac{5}{7} \, (0.7143), \, \frac{2}{3} \, (0.6667), \, \frac{1}{2} \, (0.5), \, \frac{2}{5} \, (0.4)
\]

So the descending order is:
\[
\frac{3}{4}, \frac{5}{7}, \frac{2}{3}, \frac{1}{2}, \frac{2}{5}
\]

---

Would you like more details or have any further questions?

### Follow-up questions:
1. How do you find multiples of any number in a given set?
2. How can you quickly compare fractions without converting them to decimals?
3. Why is converting fractions to decimals helpful for comparison?
4. What is the general method to find percentages?
5. How can you arrange fractions in ascending order?

**Tip**: When comparing fractions, finding a common denominator or converting them to decimals can make the process faster.

Find the percentage of numbers which are multiples of 3 from the set {1,2,3,4,5,...,9}. Arrange the following fractions in descending order: 1/2, 2/3, 3/4, 5/7, 2/5.

Learn how to calculate the percentage of numbers that are multiples of 3 from a given set, and arrange fractions like 1/2, 2/3, 3/4, 5/7, and 2/5 in descending order. This problem involves concepts of percentages and comparing fractions, suitable for students in Grades 6-8.

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