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10x=210
x =21
8. 12/30=24/x
12x=720
x =60
panjang lebar
10 6
35 x
dikali silang mnjdi
10x=35×6
10x=210
x=210:10
x=21 (c)
no. 8
lebar panjang
12 24
30 x
dikali silang menjadi
12x=30×24
12x=720
x =720 : 12
x = 60 (c)