Boxes M and N each have 'z' green balls and the rest are yellow balls. The probability of choosing a yellow ball from box M is 0.6, and the probability of choosing a green ball from box N is 0.5. The total number of balls in box M and box N is 'a + z' and 'a + 10' respectively. Find the probability of choosing green balls from box M if 10 more green balls are added to it.
1
0.5
2
0.8
3
0.4
4
0.3
5
0.6