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February 13, 2016
Posted by **Celeste** on Thursday, November 15, 2012 at 9:51am.

- 7th Grade Math!! -
**Ms. Sue**, Thursday, November 15, 2012 at 11:26amYou can use a proportion. Cross multiply and solve for L (length).

(1/2)/10 = L/18

10L = 9

L = 9/10 inch

Figure the width on the blueprint the same way that I found the length.