What makes you special?

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

The area of square garden is 300m squared. how long is the diagonal?

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?