64
The answer is 66.
18
22
Three digits can't possibly add up to 900. The largest possible sum of 3 digits is (9 + 9 + 9) = 27.
64
The number is 85.
64
The answer is 66.
An even number whose digits add up to 9 or a multiple of 9.
Two-digit prime numbers whose digits add up to 10 are:193773
992
18
67
66
15
23 or 41