Dennis is building a scale model of an office building. He has chosen to use a sclae of 1.0 in. = 15 ft. If the actual height of the bulding is 180ft, how tall will his model be?? :)

for similar objects with dimensions (x,y) and (x',y'), x/x' = y/y'.

Or, if you are not used to formulae, by reasoning,

15 ft is represented by 1.0 in.
1 ft is represented by __ in.
So, 180 ft will be represented by __ in.

Hmm...
I'll help a bit more
1in = x
---- ----
15ft 180ft