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usia Rano= x+5
(x-6)/(x+5-6)
=4/5
(x-6)/(x-1)
=4/5
5x-30=4x-4
5x-4x=30-4
x=26
Usia Rano =x+5
= 26+5=31 thn.
dan 9 thn yg akn dtg usia Rano=31+9=40 thn