A spends 20\% of his monthly salary on house rent and 25\% of the remaining salary on travelling. He uses the rest of his salary on food and children's education in the ratio 3:5 respectively. If the difference between the amount spent on children's education and house rent is Rs. 700, what is A's monthly salary (in Rs)?

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**Solution:**

1. Let the monthly salary be Rs. $100x$.

2. Amount spent on house rent = 20\% of salary = Rs. $20x$.

3. Remaining salary after house rent = $100x - 20x = 80x$.

4. Amount spent on travelling = 25\% of remaining salary = $\frac{25}{100} 	imes 80x = 20x$.

5. Remaining salary after travelling = $80x - 20x = 60x$.

6. This remaining amount is spent on food and children's education in the ratio 3:5.

- Total parts = $3 + 5 = 8$.

- Amount on food = $\frac{3}{8} 	imes 60x = 22.5x$.

- Amount on children's education = $\frac{5}{8} 	imes 60x = 37.5x$.

7. According to the question, the difference between the amount spent on children's education and house rent is Rs. 700:

$$37.5x - 20x = 700$$

$$17.5x = 700$$

$$x = \frac{700}{17.5} = 40$$

8. Therefore, monthly salary = $100 	imes 40 = 	ext{Rs. } 4000$.

**Answer:** Rs. 4000

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