a+b+c=60
a:b=10 rest 3 =>a=10b+3 sau 10b=a-3 sau b=(a-3)/10
a:c=26 rest 1 =>a=26c+1 sau 26c=a-1 sau c=(a-1)/26
a + (a-3)/10 + (a-1)/26 = 60
10=2x5
26=2x13
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c.m.m.m.c.=2x5x13=130 numitor comun
130a+13(a-3)+5(a-1)=60x130
130a+13a-39+5a-5=7800
148a=7844
a=53
b=(53-3)/10=5
c=(53-1)/26=2