There are only r red counters and b blue counters in a bag A counter is taken ar random from the bag The proability that the counter is blue is 4/9 The counter is put back in the bag 6 more red counters and 3 more blue counters are put in the bag A counter is taken at random from the bag The probability that the counter is blue is 5/12 Find the number of red and number or blue counters in the bag