Ashley is reading the blueprint above to build a game room. The scale is 1 cm = 10 feet. If the length of the south wall is 40 feet, how many centimeters is y? 4 cm

Question

pfenn1 · Answer

This is a ratio problem.  If 1 cm on plan = 10 feet in life, then ?cm=40 ft.$$\frac{1}{10}=\frac{x}{40}$$

anonymous · Answer

cant get any simpler huh thx

anonymous · Answer

I prefer dimensional analysis 

40 ft  *        1 cm / 10 ft  
            ( conversion factor)
the ft cancels out :)

anonymous · Answer

left only with cm

pfenn1 · Answer

They are really the same thing.  $$\frac{1 cm}{10 ft}=\frac{x cm}{40 feet}$$Rearrange$$x=\frac{40\cancel{ft}}{10\cancel{ft}}\times 1cm$$ Same exact thing.