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Verified answer
1.Feri : aris = 7:8selisih = 8-7 =1 ---> 1 tahun 6 bulan =18 bulan
a. feri = 7/1 x 18
= 126 bulan
= 126/12
=10,5
= 10 tahun 6 bulan
b.aris = 8/1 x 18
=144 bulan
= 144/12
= 12 tahun
2.Aris : feri =3:5
selisih =5-3 =2---> 8 butir
a.feri = 3/2 x 8 = 12 butir
b.feri = 5/2 x 8 = 20 butir