Quantitative Aptitude - Arithmetic Ability Questions

Raghu's tanker can fill a cistern in 4 hours. After half the cistern is filled, three more similar tankers are opened. What is the total time taken to fillthe cistern completely?

Tanya got an increment of 15% in her salary. If her enhanced salary is Rs.14,030. What was her original salary?

What is the value of √[(1 - sinA)/(1 + sinA)]?

If 14.35 - (1.956 - x ) - 83.92 = 3.858 then what is the value of x?

The diagonal of a square equals the side of an equilateral triangle. If the area of the square is 12 sq cm, what is the area of the equilateral triangle?

The value of tan 315° cot (­ -405° ) is equal to

A 1.6 m tall observer is 45 meters away from a tower. The angle of elevation from his eye to the top of the tower is 30°, then the height of the tower in meters is

If x = (√5) + 1 and y = (√5) – 1, then what is the value of (x2/y2) + (y2/x2) + 4[(x/y) + (y/x)] + 6?