Răspuns:
5c...2n...4a....44lei ×3
3c....6n....2a....40lei
15c...6n...12a...132lei
3c...6n....2a.....40lei
12c+10a= 92lei
3a=c
36a+10a= 92
46a= 92
a= 92÷46= 2
c= 2×3= 6
3×6+ 6n+ 2×2= 40lei
18+4+6n= 40lei
6n= 40-22
6n= 18
n= 18÷6= 3
6×6+ 2×3+ 10×2= 36+6+20= 62 lei