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9 dasarwarsa = 90 tahun
(5)1/4-(2)1/6
= 21/4-13/6
= 63-26/12
= 37/12
=(3)1/12
11. A
3biskuit + 2permen + 5coklat
= 3(1/2) + 2(1/3) + 5(1/10)
= 3/2 + 2/3 + 1/2
= 9+4+3/6
= 16/6
=(2)2/3
15. C
target = 45km
kelurahan jaya
12000m = 12km
kelurahan adil
2500dam = 25km
maka sisa jalan yg blm dibuat
45-(12+25) = 8km
16. D
12 windu = 12*8 = 96 tahun
9 dasawarsa = 9*10 = 90 tahun
maka selisihnya
96-90= 6tahun