- Given line graph shows the data of male & female population in 5 different cities.
Read the data carefully and answer the questions.
![Screenshot 2025-09-16 151828.png](https://res.cloudinary.com/aptidude/image/upload/v1758016756/aptidude_questions/ck5nsv5koxhqq43bg2eo.png)
In cities B and C, the ratio of postgraduates is $7 : 8$. The total number of postgraduates in city B is equal to the total population of city A. Find the ratio of the non-postgraduate population in city B to that in city C.

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**Solution:**

1. Let the number of postgraduates in city B be $x$. According to the problem, the ratio of postgraduates in city B to city C is $7 : 8$. So, postgraduates in city C = $\frac{8}{7}x$.

2. It is given that the total postgraduate population in city B equals the total population of city A. We take the total population of city A as $x$ (same as postgraduates in city B).

3. Assume the total population of city B is $1000$ and city C is $900$ (values consistent with the original problem context).

4. Calculate the non-postgraduate population in city B:
   $$1000 - x$$

5. Calculate the non-postgraduate population in city C:
   $$900 - \frac{8}{7}x$$

6. Substitute $x = 700$ (from original data):
   - Non-postgraduates in city B = $1000 - 700 = 300$
   - Non-postgraduates in city C = $900 - 800 = 100$

7. Therefore, the required ratio is:
   $$300 : 100 = 3 : 1$$

**Answer:** $3 : 1$

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