Quantitative Aptitude - Arithmetic Ability Questions

What is the average of first 19 odd numbers?

The sum of digits of a two-digit number is 9. When the digits are reversed, the number decreases by 45. Find the changed number.

Which of the following numbers is not a prime number?

In a mixture of 45 litres, the ratio of liquid A and liquid B is 7 : 2. If 11 litres of liquid B is added to the mixture, then what will be the ratio of liquid A and liquid B in the new mixture?

Of the 3 numbers whose average is 112, the first is 3/13 times the sum of other 2. The first number is _____.

If a2+1=9a, (a≠0) then the value of a2+1a2 is

What is the area (in square units) of the figure enclosed by the x-axis, the y-axis and the line x + 2y = 6 ?

The diagonals of two squares are in the ratio 5:2.The ratio of their area is