a=D,b=Î
a:b=c rest r =>a=c*b+r
c=1/4*b
r=c/2=>r=(1/4*b)/2=>r=b/8
b+r=99=>b+b/8=99 /*8 =>8*b+b=99*8=>9*b=792=>b=792/9=>b=88=>
=>r=b/8=>r=88/8=>r=11
=>c=1/4*b=>c=1/4*88=>c=88/4=>c=22
=>a=c*b+r=>a=22*88+11=>a=1936+11 =>a=1947
Deci a:b=c rest r =>1947:88=22 rest 11