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rudi=a
susi=b
a=b-3
a+1=2/3b +1
b-3+1=2/3b +1
b-2-1=2/3b
b-2/3b=3
(3/3-2-3)b=3
1/3b=3
b=3/ 1/3
b=3 x 3=9 (umur susi)
a=b-3
a=9-3=6 (umur rudi)