Explanation:

Let’s break it down step by step:

- Village A’s population is 35% less than B’s. Let B = x, so A = x - 0.35x = 0.65x.

- Combined: x + 0.65x = 1.65x = 8250 ? x = 5000 (B), A = 3250.

- The adult:children ratio for both villages together is 20:13. So let’s call adults = 20k, children = 13k.

- Total pop: 20k + 13k = 33k. But this sum must be 8250 ? k = 250.

- So, adults = 5000, children = 3250.

- The difference between adults and children = 5000 - 3250 = 1750 (matches the info).

- In village A: Adults are 60% more than children. Let’s call children in A = a. Adults in A = a + 0.6a = 1.6a.

- Population A: a + 1.6a = 2.6a = 3250 ? a = 1250. Adults in A = 1.6 × 1250 = 2000.

- Similarly in B: Let children in B = b, adults in B = 1.5b.

- B’s total: b + 1.5b = 2.5b = 5000 ? b = 2000. Adults in B = 1.5 × 2000 = 3000.

Now, the question: What’s the difference between adults and children in village B?

Adults in B = 3000, Children in B = 2000 ? 3000 - 2000 = 1000.

- Option 4 is 1000.

- That matches our calculation.

- The other options (1200, 800, 1500, 900) don’t fit.

The answer is Option 4 – 1000.