a+a/4+a/3=1995 nmc=12
(12a+3a+4a)12=1995
19a/12=1995
a=1995x12/19
a=1260 a/4=1260/4=315 a/3=420
proba 1260+1260/4=1260/3=1260+315+420=1995
a+b+c+d=15748
b-d=5268 b=5268+d
a+c=6404
6404+b+d=15748
b+d=15748-6404
b+d=9344 5268+d+d=9344 2d=9344-5268 d=4076/2 d=2038
b+2038=9344 b=9344-2038 b=7306
a+c=6404 6404:2=3202 a=3200 c=3204 a+c=3200+3204=6404
proba 3200+7306+3204+2038=10506+5242= 15748