Question

the summer vacation of a school started on 8 may and ended at on 15 July how long was the school closed

Answer 1

$31 - 8 = 23 \\ 23 + 1 = 24 \\ 24 + 30 = 54 \\ 54 + 15 = 69 \: \\ my \: calculation \: comes \: 69 \: days$