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प्रश्न
A model of an aeroplane is made to a scale of 1 : 400. Calculate : the length, in cm, of the model; if the length of the aeroplane is 40 m.
उत्तर
Model of an aeroplane to the actual = 1 : 400
∴ Scale factor = `400/1 = k`
Actual length of aeroplane = 40 m
Then length of model = `1/k` × actual length
= `(40 xx 1)/400`
= `1/10 m`
= `1/10 xx 100`
= 10 cm
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