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b=0,75a
c=116⅔ % × b= 7/6 b = 7/6 * ¾a=⅞a
100a+10b+c-(100c+10+a)=99
100a+10b+c-100c-10b-a=99
99a-99c=99
a-c=1
c=a-1=⅞a
⅛a=1
a=8
c=7
b=6
100a+10b+c=867