If the length of a rectangular field is twice the width and the perimeter is 24. write an equation that an be used to solve for the dimensions length and width. solve the equation.

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?