D1: 3(4) - 2 = 10 D2: 10 - 2 = 8 D3: 8 - 2 = 6 D4: 6 - 2 = 4 D5: 4 - 2 = 2 D6: 2 - 2 = 0
So it would be 6 days until you reach zero. Another way you could do it is 12 divided by 2.
Hope I helped :)
9.5m questions
12.2m answers