Răspuns :
a=primul numar
a+2=al doilea numar
a+a+2=842
2a=842-2
2a=840
a=840:2
a=420
a+2=420+2=422
a+2=al doilea numar
a+a+2=842
2a=842-2
2a=840
a=840:2
a=420
a+2=420+2=422