Quantitative Aptitude - Arithmetic Ability Questions

A certain sum of money becomes 4 times of itself in 30 years at a rate of simple interest. In how many years it will become double of itself at the same rate of simple interest?

If curved surface area of a cylinder is 1386 sq cm and height is 21 cm, what will be its radius? (Take π = 22/7)

The volume of a cube is 166.375 cm3. Find its side (in cm).

20 kg of a mixture of wheat and husk contains 5% husk. How many kg more of husk must be added to make the husk content 20% in the new mixture?

A 145 m long train crosses a 655 m long bridge in 36 seconds. What is the speed of the train?

Qamar gained 16% on the resale of a used stereo. If he purchased the item for Rs. 1500, how much did he sell it for?

If xy+yz+zx = 1, then the value of (1+y2)(x+y)(y+z) ?

If 2x - 5y = 5 and 2x - y = 9, then x - y is ______.