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September 16, 2014

September 16, 2014

Posted by **Nikki** on Wednesday, November 10, 2010 at 11:05pm.

"The zipper and the safety pin were invented in the 14th century. The safety pin was invented 44 years before the zipper. The sum of the years in which they were invented is 3742. In what year was the zipper invented?"

- Math -
**Jen**, Thursday, November 11, 2010 at 10:17amx+y=3742

x=y-44

y-44+y=3742

2y-44=3742

2y=3786

y=1893

Now plug that back into either of the first two equations to solve for x.

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