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18.ayah :ibu =9:8selisih = 9-8 =1 ---> 6 tahun
umur ayah = 9/1 x 6 = 54 tahun
ibu = 8/1 x 6 = 48 tahun
jawab. B
19.skala 1 : 500
a sbnrnya =8 x 500 = 4000 cm = 40 m
t sbnrnya = 5 x 500 = 2500 cm = 25 m
luas sbnrnya = 1/2at
=1/2 x 40 x 25
=20 x 25
= 500 m²
jawab.D