Question
β479385A267β is ten-digit number which is divisible
by 9, what is the value of βAβ?Solution
Divisibility by β9β: Sum of the digits must be divisible by β9β. So, (4 + 7 + 9 + 3 + 8 + 5 + A + 2 + 6 + 7) must be divisible by β9β Or, (51 + A) must be divisible by 9. So, A = 3