You're looking at a catalog that sells cooking supplies. Some of the items are drawn in scale at a ratio of 1:12, in cm.

If a scale drawing of one of these items is 3 cm wide, how wide is the actual items in cm?

Question

You're looking at a catalog that sells cooking supplies. Some of the items are drawn in scale at a ratio of 1:12, in cm. 

If a scale drawing of one of these items is 3 cm wide, how wide is the actual items in cm?

lapinblanc · Answer

Ratio solutions follow:
a/b=c/d
you have 
1/12=3/x
solve for x

the_legend_of_kris · Answer

How do I solve for X?

the_legend_of_kris · Answer

I believe its 36cm, but I'm not sure.

meredith17 · Answer

Step 1: Cross-multiply.
1
12
=
3
x
1*x=(3)*(12)
x=36
Answer:
x=36

lapinblanc · Answer

That answer is exactly correct. To solve for x you would have multiplied by reciprocals, which would have looked like:
1/12=3/x
12(1/12)=12(3/x)
1=36/x
x*1=x(36/x)
x=36