A 100-day training course begins on 15th March, and 15th March is counted as day 1 of the course. On which date is the last day (day 100) of the course?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 22nd June
Count the course days month by month, using the number of days in each month (March 31, April 30, May 31), until 100 days are used.
March: 15th to 31st \(=31-15+1=17\) days (days 1 to 17)
April: 30 days, total \(17+30=47\)
May: 31 days, total \(47+31=78\)
Days still needed in June \(=100-78=22\)
So day 100 is 22nd June