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2. 120/420 = 60/210 = 2/7 = 4/12 = 30/105
3. 140/280 = 17,5/35 = 70/140 = 1/2 = 4/8
4. 300/800 = 3/8 = 30/80 = 15/40 = 12/32
5. 1.125/1750 = 45/70 = 225/350 = 9/14