Define Red Data Book.

Red Data Book is maintained by __________

Define Elastic body. Define Elastic.

Define plastic body. Define Plasticity.

The sum of the costs of one book each of Mathematics, Physics and Chemistry is Rs 210. Total cost of a mathematics book, 2 physics books, and a chemistry book is Rs. 240/- Also the total cost of a Mathematics book, 3 physics book and 2 chemistry books is Rs. 300/-. Find the cost of each book using matrices.

Reema has 24 notebooks and 18 books. Find the ratio of notebooks to books.

A bookshelf contains 40 books marked with numbers 1 to 40 . If one book is drawn from this shelf at random, then the probability that the number on the book is a perfect square is