A boy has enough money to buy 20 books. If each book costs 25 paise less, he could buy two more books and still have 70 paise left. The money boy has is?
Q40. A boy has three library tickets and eight books of his interest in the library. Of these eight, he does not want to borrow Chemistry Part II unless Chemistry Part I is also borrowed. In how many ways can he choose the three books to be borrowed?