If the average age of 20 students in Class-I is 10 years and average age of 25 students in Class II is 12 years, find the average age (in years) of all students.

Insert the missing character depicted by '?'

Who has been appointed as first-ever Ombudsman (Ethics officer) of BCCI?

What fraction of 2 hours is 12 seconds?

If selling price is Rs. 72 and Gain percentage = 20%, calculate the Cost Price.

In an examination, student gets on average 76 marks. The total marks for five subjects is 500. His marks in 4 subjects are mentioned, calculate the marks obtained by the student in Mathematics marked ass 'x' in the below table.

Ravi, Rohan and Rajesh alone can complete a work in 10, 12 and 15 days respectively. In how many days can the work be completed, if all three work together?

An example of Full Duplex communication channel.