Quantitative Aptitude - Arithmetic Ability Questions

A certain sum of money becomes double of itself in 15 years at a rate of simple interest. In how many years will it become 5 times of itself at the same rate of simple interest

ABCD is a quadrilateral with AB = 9 cm, BC = 40 cm, CD = 28 cm, DA = 15 cm and angle ABC is a right –angel. 
What is the area of triangle ADC?

What is the value of tan 4π/3?

Coefficient of x2 in 4x3 - 2x2 + 2x -­ 3 are

Determine the value of y-1y2 when y4+1y4=34

If 5x ­- 40 = 3x, then the numerical value of 2x -­ 11 is

The shadow of a tower when the angle of elevation of the sun is 45°, is found to be 10 m longer than when it was 60° . The height of the tower is

If x - y = -8 and xy = 45, then (x2 + y2) is