Can you guess the smallest whole number?
Number Theory
Level
1
if the 7-digit integer is divisible by 9, what's the smallest whole number in place of ?
3
18
6
7
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1 solution
Note that the sum of the digits is equal to = 4+8+1+6+7+3 = 29.. Now for the number to be divisible by 9, the sum of the digits must me the multiple of 9..
Here, the next and the closest multiple of 9 after 29 is 36.
Hence, z = 36 - 29 = 7.