1:40: 2 / 3: 12 cm: 14.4 cm

1:40: 2 / 3: 12 cm: 14.4 cm

1:40: 2 / 3 = 100: 40 = 2.5
12 cm: 14.4 cm = 5 / 6

First simplify the ratio, then calculate the ratio. 3kg: 800g, 1 / 12: 5 / 24

3kg: 800g
=3000 g: 800 g
=3000：800
=15：4
1 in 12: 5 in 24
=2：10
=1：5

2 / 5 kg: 500g, simplify the ratio first, then calculate the ratio

2 / 5 kg: 500g
=400:500
=4:5
=0.8
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