If 2 is added to five times a number, the result is equal to 5 more than four times the number find the number

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?

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect

The quotient of 15 and a number is 1 over 3 written as an equation