Question

Bunica are in ograda rate si porci.Acestea au in total 24 picioare si 10 capete. Cati porci are bunica

Answer 1

a-rate,b-porci
a+b=10=>a=10-b
2a+4b=24(2a-notez asa fiindca ratele au 2 picioare;4b-au 4 picioare)
2(10-b)+4b=24
20-2b+4b=24
2b=4
b=2
a+b=10
a+2=10
a=8