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Crazy boy [7]
3 years ago
10

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

Mathematics
2 answers:
melisa1 [442]3 years ago
6 0
10+10 equals 20

blank+9 equals 20

9+11 equals 20

Answer=11
Otrada [13]3 years ago
4 0
11 is the answer.
10+10=20
20-9=11
11+9=20
11
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