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Verified answer
1 km = 100.000 cm840 cm : 1/20 km
840 : ( 1/20 x 100.000)
840 : 5000
84:500
42:250
21:125
Verified answer
840 cm : 1/20 km= 840 cm : 1/20 x 100.000 cm
= 840 cm : 5.000 cm
= 840 cm / 40 : 5.000 cm / 40
= 21 : 125