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单选题
In the correctly worked out addition example below, what is the greatest possible value of digit B?
A
9
B
8
C
6
D
5
E
4
参考答案
参考解析
解析：
Since 2 is carried over from adding the digits in the first column, in the second column A+B+B+1= 14, so A+2B= 13. Since B must be an integer, A cannot be 0. Hence, the greatest possible value of digit B occurs when A = 1 and B = 6.
Since 2 is carried over from adding the digits in the first column, in the second column A+B+B+1= 14, so A+2B= 13. Since B must be an integer, A cannot be 0. Hence, the greatest possible value of digit B occurs when A = 1 and B = 6.
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18D
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30
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