Quantitative Aptitude - Arithmetic Ability Questions

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

If Tan θ = 7/24, then what is the value of Cosec θ?

Pipe A can empty a filled tank in 28 hours while Pipe B can fill the same tank, when empty in 35 hrs. If alternatively Pipes A and B are turned on for an hour each time, starting when the tank is full, how long will it take to empty the tank?

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

The vertical angle A of an isosceles triangle ΔABC is three times the angle B of it. The measure of the angle A is

What is the value of {[sin (x + y) – 2 sin x + sin (x – y)]/[cos (x – y) + cos (x + y) – 2 cos x]} × [(sin 10x – sin 8x)/(cos 10x + cos 8x)]?

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

3cosA is equal to