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a/b=3 rest 4⇒a=3*b+4
b/c=4 rest 3⇒b=4*c+3
a=3*(4c+3)+4
a=12c+9+4
a+b+c=186
12c+9+4+4c+3+c=186
17c+16=186⇒17c=186-16⇒c=170/17⇒c=10
b=4*c+3⇒b=4*10+3⇒b=43
a=3*b+4⇒a=3*43+4⇒a=133
verif:
a+b+c=186
133+43+10=186 A