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单选题
If the average of the two-digit numbers 1N, N7, and NN is 35, then N= ______.
A
2
B
3
C
4
D
5
E
6
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参考解析
解析：
If the average of the two-digit numbers 1N, N7, and NN is 35, then the sum of the three numbers is 3×35 or 105. Since 1N+N7+NN = 105, look for a value of N in the set of answer choices such that N+7+N is 15 or 25. For choice C., N = 4, 14+47+44 = 105
If the average of the two-digit numbers 1N, N7, and NN is 35, then the sum of the three numbers is 3×35 or 105. Since 1N+N7+NN = 105, look for a value of N in the set of answer choices such that N+7+N is 15 or 25. For choice C., N = 4, 14+47+44 = 105
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