Quantitative Aptitude - Arithmetic Ability Questions

The HCF of 20, 28 and 48 is

What is the total surface area (in sq cm) of a hollow cylinder open at both ends, if its length is 22 cm, external radius is 7 cm and thickness is 1 cm? (Take π = 22/7)

A circle has its centre at O . A tangent drawn from a point P , which is situated outside the circle, touches the circle at A. If PA = 4 cm & PO=5 cm, then the length of the radius of the circle is

The effective annual rate of interest corresponding to a nominal rate of 7% per annum payable half­yearly is

Find the sum of first 8 odd prime numbers.

Find the mean of the first 6 prime numbers?

If A is 50% more than B, then B is what percent of A?

The midpoints of AB and AC of a triangle ABC are X and Y respectively. If BC+XY=12 units, then BC­XY is