Posted by marko on Wednesday, May 16, 2012 at 10:02pm.
a floor plan has a scale of 2cm : 3m
what is the actual length of a room measuring 30 cm on the floor plan?
I got to 20 is that correct?

measurement  Ms. Sue, Wednesday, May 16, 2012 at 10:13pm
Nope.
How have you been taught to solve this kind of problem?
I can show you two different ways.

measurement  marko, Wednesday, May 16, 2012 at 10:15pm
i cant figure how to do this can you explain

measurement  marko, Wednesday, May 16, 2012 at 10:25pm
is it 90
i got
2cm/ 3m = 30 cm/n
= 2n = 3 (30)
= n = 90

measurement  Ms. Sue, Wednesday, May 16, 2012 at 10:28pm
One way to do this is to set up a proportion or ration.
2 cm is to 3 m as 30 cm is to ? m
2/3 = 30/x
Cross multiply and solve for x.
2x = 90
Divide both sides by 2.
x = 45 m
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