every TRICK in the BOOK meaning in Hindi| every TRICK in the book Hindi matlab#shorts#englishbattle

In a library 60% of the books are in Hindi, 60% of the remaining are in English and rest of the books are in there are 3600 books in English, then the total no. of books in Urdu are :

Five books of History, Mathematics, English, Hindi and Science are kept on top of each other. English is kept between History and Mathematics. Hindi and Science are kept together. Science is kept above Mathematics. Which book is kept in the middle?

In a school library, the ratio of mathematics books to Science books is the same as the ratio of Science books to Hindi books. If there are 450 books in Science and 300 books in Hindi, find the number of books in Mathematics.

In how many ways can 21 identical English and 19 identical Hindi books be placed in a row so that no two Hindi books are together?