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2 votes
When you add 9 to me, the sum is the same as 10 + 10

User Denbec
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2 Answers

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10+10 equals 20

blank+9 equals 20

9+11 equals 20

Answer=11
User Poiz
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7.9k points
2 votes
11 is the answer.
10+10=20
20-9=11
11+9=20
11
User Nathan Teague
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7.2k points

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