You should find the Least common multiple of 4 and 6.
Multiples of 4 are:
4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76 etc.
and the multiples of 6 are:
6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, ...
Common multiples of 4 and 6 are simply the numbers that are in both lists:
12, 24, 36, 48, 60, 72, ....
So the least common multiple of 4 and 6 is the smallest one of those: 12
Answer: every 12th shoot was made by Kobie and Aaron at the same time.
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