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9/4 × X = 12
9X = 12 × 4
X = 48/9
X = 5 3/9
4. L = P . l
102½ = P. 7½
205/2 = P. 15/2
205 = P. 15
P = 205/15
P = 13 10/15
5. 40/[(3/8) × 5] = 40/ (15/8) = 320/15 = 21 5/15 hari
maaf kalau salah