Tritium (half-life = 12.3 y) is used to verify the age of expensive brandies. If an old brandy contains only the following fraction of the tritium present in new brandy, how long ago was it produced?

Question

1/16

Answer 1

(1/2)^x=1/16

12.3x=?

Answer 2

i don't think it 4

Answer 3

x=4

12.3(4)=?

Answer 4

1/16 = (1/2)^4 so four half lives
4 * 12.3 as TutorCat said