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AMO 2027 Grades 6-7 SET 21 - Self-study Question 15

AMO · AMO 2027 Grades 6-7 SET 21 - Self-study

Question 15

If the 7-digit number 123AB45 is divisible by 99, then what is A + B?


A. 3

B. 6

C. 9

D. 12

E. None of the above

**Editorial note for this self-study exercise:** A and B are single decimal digits, each from 0 to 9, and may be zero. Enter A + B, not the seven-digit number or a choice letter.