Question

A model car is built on a scale of 2:21 of a real car . If the real car has a height of 1.7 meters , what is the height of the model in centimeters ?
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Answer 1

To get from the real value to the model value, you must divide by 21 and times by two (since 21/21 = 1 and 1 x 2= 2 in the ratio) this is the same as multiplying by the fraction 2/21.
So, 1.7 x 2/21 = 17/105 = 0.16m or 16cm