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2 / 20 = 1/so + 1/12
1/10 = 1/so + 1/12
1/10 - 1/12 = 1/so
(6 - 5) / 60 = 1/so
1/60 = 1/so
60 cm = so
M = si/so
= 12 / 60
= 1 / 5 kali