Quantitative Aptitude - Arithmetic Ability Questions

A solid brass sphere of radius 2.1 dm is converted into a right circular cylindrical rod of length 7cm. The ratio of total surface areas of the rod to the sphere is

An army lost 10% of its men in war, 10% of the remaining died due to disease and 10% of the rest were declared disabled. Thus the strength of the army was reduced to 7,29,000 active men. The original strength of the army was

If x + y = 3, then what is the value of x3 + y3 + 9xy?

The sum of 2xy(3x + 4y - 5z) and 5yz(2x - 3y) is

If x -­ y = ­7 and x + y = 13, then x2 - y2 is

If 4(x + 5) -­ 3 > 6 -­ 4x ≥ x -­ 5; then the value of x is

√[(1 ­ sinA)/(1 + sinA)] is equal to?

If secA + tanA = x, then find the value of x.