a+b+c=121
a/c=10+5----->a=10c+5
b/c=5r4 b------>b=5c+4
inlocuim pe(a) si (b) in relatia a+b+c=121
avem
10c+5+5c+4+c=121
16c=121-5-4
16c=112
c=112/16
c=7
inlocuim pe (c) in relatia a=10c+5
avem
10*7+5=75
inlocuim si in relatia b=5c+4
b=5*7+4
b=39
deci nr sunt
a=75
b=39
c=7
