The two-digit multiples of 8 are 16, 24, 32, 40, 48, 56, 64, 72, 80, and 88. Among these, the number 80 has digits that add up to 8 (8 + 0 = 8), while 16 (1 + 6 = 7), 24 (2 + 4 = 6), 32 (3 + 2 = 5), 40 (4 + 0 = 4), 48 (4 + 8 = 12), 56 (5 + 6 = 11), 64 (6 + 4 = 10), 72 (7 + 2 = 9), and 88 (8 + 8 = 16). Therefore, the two-digit multiple of 8 whose digits add up to 10 is 64.
64
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
66
64
64
The number is 85.
The answer is 66.
18
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
66
67
23 or 41