How about 65 because 6+5 = 11
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It you add up all the digit in the number they will total 11. For example the number 425 has digits that sum to 11. (4 + 2 + 5 = 11)
656+5=1165/13=5
29 2 * 9 = 18 2 + 9 = 11 18 - 11 = 7
The number is 23.
Use the formula for the sum of an arithmetic sequence. Start with 11, end with 99; the interval is 2.