A Sticky Situation

Cupcakes on Fire!
Topic: Sequences, Series and Patterns
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This is a video about a math challenge that states that if any one takes x number of cookies in day 1, x + 6 cookies in day 2 and so on in 5 days a total of 100 cookies are eaten then find x.

Common Core Standards: F-LE.1
Problem #: 
40 (2013-2014)
Problem Difficulty Level: 4 [?]