Help please this is due tonight

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.

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?