0
Anonymous
19
Lisa Schaefer ∙
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The sum is: 9+10 = 19
Wiki User
10
N + 9
If a number is added to itself, it is twice that number → 18 ÷ 2 = 9 → 9 + 9 = 18
9/10 divided by 10/9 equals 9/10 x 9/10 equals 81 /100
9 + 9 + 10 + 10 = 38