Respuesta :

The scale is given as

1 in = 16 ft

using this scale

1 in = 16 ft-----change this to inches

1 : 192 ---------for actual inch : inch

so for 21 in , this will be;

1= 192

21= ?

21 * 192 = 4032 in

Actual span will be 4032 inches or 336 ft

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