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

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

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.