Quantitative Aptitude - Arithmetic Ability Questions

Find the sum of interior angles of a dodecagon?

Determine the value of ‘r’ for which the equation 13x + 5 = rx + 18 has no solution.

The radii of two concentric circles are 68 cm and 22 cm. The area of the closed figure bounded by the boundaries of the circles is

In a triangle PQR, ∠PQR = 90 deg, PQ = 10 cm and PR = 26 cm, then what is the value (in cm) of inradius of incircle?

At least one diagonal bisects the other in a _____.

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

Two students appeared for an examination. One of them secured 26 marks more than the other and his marks were 75% of the sum of their marks. The marks obtained by them are

The sum of 15 observations of a data is (434 + x). If the mean of the data is x, then the value of x is