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x = 20 menit
14 / x = 8 / 20
14 / x = 2 / 5
x = 35 kali
14/2=7
8/2=4
20/4=5
5X7=35
atau
20/8=2.5
2.5X14=35
berarti kincir air berputar sebanyak 35 setiap 20 menit