When 0.39:78, 4 cm:20 km, 5:3:25:27, 24:0.2, simplify the comparison and calculate the ratio
2 of 0.75 = 3 / 8 = 3:8
39:78 = 1:2
4cm to 20km = 4:20 * 1000 * 100 = 1:500000
3 / 5:27 / 25 = 3 / 5:27 / 25 = 15:27
2 = 0.2:0.2 = 1:1
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