选择题
2007 AMC 8 Problem 1: Final Week Average
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