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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