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It reads your mind! How could it be? Can you figure this out?

Flamenco_Girl 发表评论于
Good job Mellow!
Mellow 发表评论于
Assumption:十位数数字为b,个位数数字为a
Formula:10b+a-(b+a)=10b-b=9b
See the chart,the signs beside the numbers which are multiplication (1 to 9,whichever you chose for the b)of 9 are the same。
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