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The scale "4 cm = 1 m" is a factor of 1:25 (1/25th scale). 1m/.04m = 25
1 cm times 20cm
12m = 1200 cm 1200cm / 30 cm = 40 SO THE ANSWER IS 1:40 by Hanny Tufail hanny.tufail@gmail.com
Convert the units of both sides to the same, then remove the units and simplify (if possible by dividing both sides by a common divisor greater than 1). eg The Landranger series map scale of 2 cm equals 1 km: 1 m = 100 cm 1 km = 1,000 m → 1 km = 1,000 x 100 cm = 100,000 cm 2 cm : 1 km → 2 cm : 1 x 100,000 cm → 2 cm : 100,000 cm → 2 : 100,000 → 1 : 50,000
100 cm in 1 metre