What will be the compound interest earned on an amount of Rs. 5000 in 2 years?

I. The simple interest on the same amount at the same rate of interest in 5 years is Rs.2000.

II. The compound interest and the simple interest earned in one year is the same.

III. The amount becomed more than double on compound interest in 10 years.

If x+1x=5, then the value of 6xx2+x+1 is,

If a > b > 0, AB = a - b cm, BC = 2√ab cm, then ∠ABC is

PR is a tangent to a circle with centre O and radius 4 cm at point Q. If ∠POR = 90°, OR = 5 cm and OP = 20/3 cm, then the length of PR is:

From a point, 40 m apart from the foot of a tower, the angle of elevation of its top is 60°. The height of the tower is

The radius of a sphere and hemisphere are same. The ratio of their total surface area is

Two equal arcs of two circles subtend angle of  60° and 75° at the centre. The ratio of the radii of the two circles is

If x + (1/x) = 2, then what is the value of x64 + x121?

If the diameter of a sphere is 14 cm, then what is the surface area (in sq.cm) of the sphere?