Răspuns :
a+b+c=120
a-25=x
b-38=x
c-30=x
25+38+30=93
120-93=27
27:3=9
a=9+25=34
b=9+38=47
c=9+30=39
a-25=x
b-38=x
c-30=x
25+38+30=93
120-93=27
27:3=9
a=9+25=34
b=9+38=47
c=9+30=39
25l+38l+30l=93l--s-au scos
120l-93l=27l--au ramas in cele 3but
27l:3=9l--(cite 9l au ramas in fiecare din cele 3but)
9l+25l=34l--erau-1but
9l+38l=47l--erau-2b
9l+30l=39l--erau in 3but
verif:34l+47l+39l=120l
120l-93l=27l--au ramas in cele 3but
27l:3=9l--(cite 9l au ramas in fiecare din cele 3but)
9l+25l=34l--erau-1but
9l+38l=47l--erau-2b
9l+30l=39l--erau in 3but
verif:34l+47l+39l=120l