there is 40 chapters
my opinion is 40th day
If the one pack a day smoker has a habit for 40 years, that would come to 20 cigarettes X 365 days per year X 40 years. If that smoker had a two pack a day habit, then the answer would need to be doubled.
The Day I Swapped My Dad for Two Goldfish has 40 pages.
Every day at 13:30 and 4:40-5:55
He had a 40 year Army career.
20% first day, 40% second day, Total percent of rain over the two days is (20+40)/2 = 30% per day
40 minutes. 24 miles is two thirds of 36. Two thirds of an hour is 40 minutes.
If a day took 40 hours, then a day would take 40 hours.
Ascension day falls always 40 days after the Easter and the month of it is May.
AR 40-66
DA PAM 385-40 -- Army Accident Investigations and Reporting