How many remainders are possible when 7 is made as the divisor?

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?

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length

Proportions in triangles solve for x