Quantitative Aptitude - Arithmetic Ability Questions

What is the length of the side of an equilateral triangle, if its area is 36√3 sq cm?

The mode of the data -3, 4, 0, 4, -2, -5, 1, 7, 10, 5 is

A sum of money becomes 77/50 of itself in 18/5 years when invested at simple interest. What is the rate (in percentage) of interest per annum?

The smallest number, which should be added to 756896 so as to obtain a multiple of 11, is

The sum of thrice a number and twice its reciprocal is 97/4. What is the number?

A pipe, working at full speed, can fill an empty cistern in 1 hour. However, during the first hour it worked at one-twelfth of its capacity, during the second hour at one-ninth of its capacity, during the third hour at one-sixth of its usual capacity and during the fifth hour it was only one -third as efficient as it was supposed to be. A second pipe also displayed similar performance, but if it worked at full speed would have filled the empty cistern in 2 hours. Together with a drain pipe that drained water out of the tank at a constant rate, the empty cistern could be filled in 5 hours, all the three pipes working concurrently. How many hours will it take the drain pipe to empty the filled cistern if no other pipe was functioning during the time?

A car covers the first 30 km at a speed of 60 kmph and the next 20 km at 80 kmph. Find the average speed.

What is the value of √121 + √12321 + √1234321 + √123454321?