Răspuns :
[98 kg-(7 ×8kg)]:2=
(98kg-56kg):2=
42kg:2=21kg (fiecare gradinita)
7×8+ 2a =98
2a=98-56
2a=42
a=21 kg a primit fiecare gradinita
Verificare
98=56+2*21
98=56+42
98=98
2a=98-56
2a=42
a=21 kg a primit fiecare gradinita
Verificare
98=56+2*21
98=56+42
98=98