exam Maths Puzzle undefined

One fourth of a number is two more than one fifth of the number. Find the number.

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exam Other Question

The problem is number 23 on page 634. Problem is
(radical 3 - radical 2)(2 radical 2 + radical 3) . I am not understanding how to do this.
A bookseller sells a book at a profit of 10%. If he had bought it at 4% less and sold it for 60 paisa more, he would have gained 18 ¾ %. What does it cost to the bookseller? (a) Rs.11 (b) Rs. 4 (c) Rs. 10 (d) Rs. 15