Question

A similar scale model of a building is 12 in tall and 9 in wide. If the actual building is 100 ft tall, how wide is the building?

97.0 ft
133.3 ft
75.0 ft
50.0 ft

Answer 1

You just put the scale of one building on one side and the scale of the similar building on other side, with width and length written in same place (denominator or numerator). With x for the part that you dont know

Length of one building / width of one building = length of other building / width of other building

12 / 9 = 100 / x

Solve for x, by cross-multiplying

12 * x = 100 * 9
12x = 900
X = 900/12
X = 75 ft