there are only 'r' red counters and 'g' green counters in a bag. A counter is taken at random from the bag. The probability that the counter is green is 4/9. the counter is put back in the bag. 4 more red counters and 2 more green counters are put in the bag. A counter is taken from the bag. The probability that the counter is green is 10/23. Find the number of green counters that were in the bag originally.