Can someone give me this answer plz it’s timing

Is a currency whose value is tied to another currency, meaning that the exchange is fixed

Ten times the square of a non-zero number is eqaul to ninety times 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?