A bookseller buys 1000 books from a publisher. He sells some books at the marked price of 24 each and disposes of the remaining books at 22.5 rupees each. If his total receipts from the sale of books is 23670 find how many books were sold at each of the prices
24x + 22.5(1000 - x )=23670
=> 24x + 22500 - 22.5x = 23670
=> 24x - 22.5 x = 23670 - 22500
=> 1.5x = 1170
=> x = 780
1000 - 780 = 220
Ans is 780 and 220