Quantitative Aptitude - Arithmetic Ability Questions

Calculate the principal if an amount of Rs. 441 is received on compound interest at the rate of 5% per annum after 2 years.

Find the value of x if 0.08x + 0.04y = 10 and 0.2(x-1) + 0.4y = 24.8

In the given figure, if AD = 12 cm, AE = 8 cm and EC = 14 cm, then what is the value of BD in cm?

The number of students in a class is increased by 20% and the number now becomes 66. Initially the number was

If a+b+c=15 and 1a+1b+1c=71abc, then the a3+b3+c3-3abc is

The traffic lights at four different road crossings change after every 15 sec, 18 sec, 27 sec and 30 sec respectively. If they all change simultaneously at 6:10:00 hours, then at what time will they again change simultaneously?

What is the average of all the one digit, two digit and three digit natural numbers?

The average of 7 numbers is 30. If the average of first three numbers is 25 and that of last three numbers is 35, then what is the fourth number?