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All multiples of 64 are multiples of 8.
The first 20 multiples of 8: 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 120, 128, 136, 144, 152, 160
eight[32 40 48 56 64 72 80 88]
The lowest common multiple of 64 and 72 is 576. Therefore, the common multiples of 64 and 72 are the multiples of 576. The first five are as follows: 576 1152 1728 2304 2880
Multiples of 4: 4, 8, 12, 16, 20 Multiples of 10: 10, 20 Therefore, the answer is 20. (: