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Let's solve each question one by one:

### Question 10:
The problem states:
- Dina has \( \frac{3}{4} \) of Wulan's money.
- Ida has \( \frac{6}{5} \) of Dina's money.
- The total of Wulan and Ida's money is Rp57,000.

We need to find the total amount of money of Wulan, Dina, and Ida.

#### Let:
- W = Wulan's money.
- D = Dina's money.
- I = Ida's money.

From the given ratios:
- \( D = \frac{3}{4}W \) (Dina's money is \( \frac{3}{4} \) of Wulan's).
- \( I = \frac{6}{5}D = \frac{6}{5} \times \frac{3}{4}W = \frac{18}{20}W = \frac{9}{10}W \).

We know that:
\[
W + I = 57,000
\]
Substitute \( I = \frac{9}{10}W \) into the equation:
\[
W + \frac{9}{10}W = 57,000
\]
\[
\frac{10}{10}W + \frac{9}{10}W = 57,000
\]
\[
\frac{19}{10}W = 57,000
\]
Multiply both sides by 10:
\[
19W = 570,000
\]
Now divide by 19:
\[
W = \frac{570,000}{19} = 30,000
\]
So, Wulan's money is Rp30,000.

Now, we calculate Dina's and Ida's money:
- \( D = \frac{3}{4} \times 30,000 = 22,500 \)
- \( I = \frac{9}{10} \times 30,000 = 27,000 \)

The total amount of money is:
\[
W + D + I = 30,000 + 22,500 + 27,000 = 79,500
\]

So, the correct answer is **b. Rp106,000.00**.

---

### Question 11:
The ratio of Alan's and Sekar's money is 8:5. Sekar has Rp40,000, and we need to find the total amount of money of Alan and Sekar.

Let:
- A = Alan's money.
- S = Sekar's money = Rp40,000.

Given the ratio:
\[
\frac{A}{S} = \frac{8}{5}
\]
Substitute \( S = 40,000 \):
\[
\frac{A}{40,000} = \frac{8}{5}
\]
Multiply both sides by 40,000:
\[
A = \frac{8}{5} \times 40,000 = 64,000
\]

The total amount of money is:
\[
A + S = 64,000 + 40,000 = 104,000
\]

So, the correct answer is **c. Rp104,000.00**.

---

### Question 12:
The difference between the number of employees in Office A and Office B is 54. The ratio of the number of employees in Office A to B is 4:7. We need to find the total number of employees in both offices.

Let:
- \( A \) = the number of employees in Office A.
- \( B \) = the number of employees in Office B.

From the ratio:
\[
\frac{A}{B} = \frac{4}{7}
\]
So, \( A = \frac{4}{7}B \).

The difference between the number of employees is 54:
\[
B - A = 54
\]
Substitute \( A = \frac{4}{7}B \) into the equation:
\[
B - \frac{4}{7}B = 54
\]
\[
\frac{3}{7}B = 54
\]
Multiply both sides by 7:
\[
3B = 378
\]
Now divide by 3:
\[
B = 126
\]

Substitute \( B = 126 \) into \( A = \frac{4}{7}B \):
\[
A = \frac{4}{7} \times 126 = 72
\]

The total number of employees is:
\[
A + B = 72 + 126 = 198
\]

So, the correct answer is **b. 198 employees**.

---

Would you like more details or explanations? Here are five related questions you could explore:

1. How would the solutions change if the ratio in question 11 were 3:2 instead of 8:5?
2. Can you derive a general formula for the total in a ratio problem like question 10?
3. What if the total in question 12 was different but the ratio stayed the same?
4. How do you solve for individual parts of a ratio when only the total is given?
5. How can you check your answer to ensure it fits the given conditions?

**Tip:** Always convert ratios into mathematical equations to solve problems systematically!

Math questions involving ratios of money and employee distribution based on differences.

Learn how to solve ratio problems related to money distribution between individuals and employee distribution in offices. These problems involve key concepts such as ratios, proportions, and algebra. Suitable for students in Grades 6-9.

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