It is: 42 mm to 23 mm
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63:8463:8463:8463:84
35/84 = 5/12
4
Convert the km to mm, then the units can be removed and the ratio found: 1 m = 1,000 mm 1 km = 1,000 m = 1,000 x 1,000 mm = 1,000,000 mm ⇒ 1 mm : 50 km → 1 mm : 50 x 1,000,000 mm → 1 mm : 50,000,000 mm → 1 : 50,000,000
84 : 104 = 21 : 26 (simplifying by dividing both sides of the ration by the hcf(84, 104) = 4)