Răspuns :
pere=a
mere=a+12
mand=a+12+15
a+a+12+a+12+15=879
3a=840a=280=pere
mere=292
mand=307
succes
mere=a+12
mand=a+12+15
a+a+12+a+12+15=879
3a=840a=280=pere
mere=292
mand=307
succes
12+12m+p+m+2p+15 =879 12+12+15=39 39+15p=840 879-840=39 268+12=280p 280+15=295mand 879-295-280=304mere