X & Y are partners sharing profits & losses in the ratio of 2:1 . Z was admitted for 1/4th share and which Rs. 15000 & Rs. 5000 were credited as the premium for good will to X & Y respectively . the new profit sharing ratio of X , Y & Z will be
a) 9:6:5
b)12:8:5
c)3:2:1
d)23:13:12