Sunday

March 29, 2015

March 29, 2015

Posted by **A Canadian** on Wednesday, January 23, 2013 at 7:44pm.

The answer is 9 weeks.

This is what I did, and it's clearly wrong:

tn = 7 + (n-1)13

tn = 7 + 13n - 13

tn = 13n - 6

100 = 13n - 6

100 + 6 = 13n

106/13 = n

I get a crazy decimal (8.1538....) which shouldn't be the answer...

What am I doing wrong, and how do you properly answer this question?

Thanks very much in advance!

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