Quantitative Aptitude - Arithmetic Ability Questions

Two pipes P and Q can fill an empty tank in 25 hours and 20 hours respectively. Pipe R alone can empty the completely filled tank in 50 hours. Firstly both the pipes P and Q are opened and after 8 hours pipe R is also opened. What will be the total time (in hours) taken to completely fill the tank?

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?

Rahi deposited Rs. 600 in a bank that promised 8% simple interest per annum. If Rahi kept the money with the bank for 5 years, she will earn an interest of

What is the circumference (in cm) of a circle whose area is 616 sq cm?

An angle in a semicircle is

Suppose that the medians BD, CE and AF of a triangle ABC meet at G. Then AG: GF is

Four numbers A, B, C and D are such that their overall average is 16. The average of A and B is 9.5. The average of C and D is

The side of an equilateral triangle is 8 cm. Find its area (in cm2).