Question

La o ferma sunt 19019 ovine,bovine si porcine.Daca 15561 nu sunt ovine,iar 10253 nu sunt porcine,afla cate animale sunt de fiecare fel.

Answer 1

$x=ovine \\ y=bovine \\ z=porcine \\ \\ x+y+z=19019 \\ \\ y+z=15561 \\ x+y=10253 \\ \\ x+15561=19019 \\ \\ \boxed{x=3458} \\ \\ 10253+z=19019 \\ \\ \boxed{z=8766} \\ \\ y+8766=15561 \\ \\ \boxed{y=6795}$

Answer 2

o+b+p=19019
b+p=15561
o+p=10253

o+b+p=19019 
o+15561=19019
o=3458

o+b+p=19019 
10253+b=19019
b=8766

o+b+p=19019 
3458+8766+p=19019 
p=19019-12224
p=6795

o-ovine 
b-bovine
p-porcine