Answer:
actually it's 8
Explanation:
You need to find the smallest number that is a multiple of both 8 and 4. This is the least common multiple.
List the multiples of each number. Find the smallest number that appears in both lists.
Multiples of 8: 8, 16, 24, 32, 40
Multiples of 4: 4, 8, 12, 16, 20
The least common multiple of 8 and 4 is 8. That means that Aisha will strike the cymbals and the triangle together in 8 beats, because 1 repetition of the 8-beat cymbal cycle is a total of 8 beats long and 2 repetitions of the 4-beat triangle cycle is a total of 8 beats long.
8 beats will pass before Aisha again strikes the cymbals and triangle at the same time.