Question

A model house is 12 cm wide. If it was built with a scale of 3 cm: 4m then how wide is the real house

Answer 1

Scale:actual=3cm:4m
actual:scale=4m:3cm

so
if a model house is 12cm then what is actual?
?m:12cm=4m:3cm
make into fractoin
?m/12cm=4m/3cm
times both sides by 12cm
?m=48cm m/3cm
?m=48m/3
?m=16m
the real house is 16m wide

Answer 2

Then it would be 16 meters wide.. 12 divided by 3 is 4, so 4x4 is 16 which would be the width of the real house.