Question
An eight-digit number, 9x54y32 is divisible by 72. Find
the maximum possible value of x + y.Solution
Given number is 9x54y32. For a number to be divisible by 72, then it should be divisible by both 8 and 9. So, we will check the divisibility rule of 8 and 9. For the given number to be divisible by 8, the last three digits of the number should be divisible by 8. Last three digits of the given number are y32. So, the possible values of y are 0, 2, 4, 6, 8. For the number to be divisible by 9, the sum digits of the given number should be a multiple of 9. So, sum of the digits of the given number
= 9 + x + 5 + 4 + y + 3 + 2 = 23 + x + y So, next multiples of 9 after 23 are 27 and 36. So, possible values of (x + y) are 4 and 13. When, x + y = 13, take y = 8 and x = 5. So, this case is valid and sufficient to conclude that maximum value of x + y = 13. Hence, option c.
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