A boy scored 125 marks and 140 marks in the first test and the second test respectively. If the maximum mark in each test is 150, then the percentage increase in his performance is ___________.

Evaluate 743 x 999.

The average age of five girls is 11. The oldest among them is 15 years old. What is the average age of the others?

If the cost of 1 dozen apples is Rs. 18, then the cost of 25 apples will be -

At a construction site, 200 workers were working on a building which is scheduled to end within 250 days. After 30 days, 20 workers leave the job. How many more days will it take to complete the work? 

If A:B :: 6:11 and B:C :: 6:7, then A:C ::_____

A train covers 400 m distance in 24 sec. Its speed is-

The salary of a person is increased by 20%. By what % the new salary must be reduced to restore the original salary?