Who is the author of the book "National Security Challenges: Young Scholars' Perspective"?

A DVD player was purchased for Rs 4860. At what price should it be sold so that 25% profit is earned?

Find the missing number?

Which state's government signed MoU with KFW to implement Zero Budget Natural Farming?

What harmful gas is released by factories and vehicles 

Processed data is called?

Vivek and Raja had some books whose ratio was 7: 9 and similarly the ratio of books of Abhishek and Raja was 7: 15, then tell us what was the ratio of books of Vivek and Abhishek?

The major component used in preparation of different types of glasses is :