ONLINE AMC 8 PREP WITH AOPS
2007 AMC 8 Problems
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1. Theresa's parents have agreed to buy her tickets to see her favorite band if she spends an average of 10 hours per week helping around the house for 6 weeks. For the first 5 weeks she helps around the house for 8,11,7,12 and 10 hours. How many hours must she work for the final week to earn the tickets?
(A) 9 (B) 10 (C) 11 (D) 12 (E) 13