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What is the difference between the average number of books sold by stores B and C together and the total number of unsold books at store A?

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**Solution:**

1. Calculate the total books sold by store B:
   - Total books at B = 50 hundreds = 5000 books
   - Percentage sold = 40\%
   - Books sold at B = $5000 	imes \frac{40}{100} = 2000$

2. Calculate the total books sold by store C:
   - Total books at C = 45 hundreds = 4500 books
   - Percentage sold = 30\%
   - Books sold at C = $4500 	imes \frac{30}{100} = 1350$

3. Find the average books sold by stores B and C:
   $$	ext{Average} = \frac{2000 + 1350}{2} = \frac{3350}{2} = 1675$$

4. Calculate the total unsold books at store A:
   - Total books at A = 35 hundreds = 3500 books
   - Percentage unsold = 100\% - 20\% = 80\%
   - Unsold books at A = $3500 	imes \frac{80}{100} = 2800$

5. Find the difference between unsold books at A and average sold books at B and C:
   $$2800 - 1675 = 1125$$

**Answer:** 1125

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