Quantitative Aptitude - Arithmetic Ability Questions

The mean of the data 2, 9, 9, 3, 6, 9, 4 is

If the radius (r) of a circle is increased by 'x' units, what is the number of units by which the circumstance of the circle is increased?

Simple interest on a sum for 10 years is equal to 5% of the principal. In how many years interest will be equal to the principal?

What is the least number that can be multiplied to 69120 to make it a perfect cube?

How much is the maximum % discount that sheela can offer to her customer on her Marked Price so that she sells her product at no profit or loss, if she had already marked her product by 25% more than the cost price?

The average revenues of 7 consecutive years of a company is Rs 83 lakhs. If the average of first 4 years is Rs 78 lakhs and that of last 4 years is Rs 90 lakhs, find the revenue for the 4th year.

The product of two numbers is 0.324. One of the numbers is 1.2. What is the other number?

Two pipes X and Y can individually fill a tank in 48 and 72 min respectively. If they are opened simultaneously, how long will it take for the tank to fill?