72 hours is exactly 3 days...
The ratio can be determined as,

Thus, the requried ratio is 7:12.
Disagree, at 16 you just get your license,while someone who’s 32 may have gotten into 2 accidents, but the 32 year old has had their licence for longer than the 16 year old,
It shows that six years pasted between 2007 and 2013 and it increased by 20,000 so add that to the population at the time the answer is 158000