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1. If a bookstore owner buys 15 books less for Tk. 900 when the price of each book goes up by Tk. 3, then find the original price of a book.
- A. Tk.20
- B. Tk.20
- C. Tk.20
- D. Tk.20
Answer: Option D
Explanation:
900⁄x- 900⁄(x+3)= 15
Or, (x+15) (x-12)= 0
So, x=12
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