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Jungerdana
a fost răspuns

a+b+c=139 unde
a=b:4
c=b:2+3 afla abc

Răspuns :

Eric32
b=4a
c=4a:2+3
a+4a+4a:2+3=139
5a+2a=139-3
7a=136
a=136:7
a=19,428
b=19,428×4
b=77,712
c=19,428×2+3
c=38,856+3
c=38,859