What's the next number 360, 180, 60, 15...?

Answer 1

3.

Note the trend in the ratio of successive terms: 1/2, 1/3, 1/4, ...
1/5 x 15 = 3

Answer 2

360 divided by 2=180
180 divided by 3=60
60 divided by 4=15
15 divided by 5=3
so the answer is 3