Question 17
Daphne is visited periodically by her three best friends: Alice, Beatrix, and Claire. Alice visits every third day, Beatrix visits every fourth day, and Claire visits every fifth day.
All three friends visited Daphne yesterday. How many days of the next $365$-day period will exactly two friends visit her?
All three friends visited Daphne yesterday. How many days of the next $365$-day period will exactly two friends visit her?