Answer :
They will occur again on day 20 . . . assuming deliveries can occur on any of the seven days of the week, then the 20th day is a Sunday (i.e. in 2 weeks and 6 days from Monday)
A Grocery Store Gets An Order Of Fresh Fruit Every 4 Days And An Order Of Canned Fruit Every 10 Days. The Store Received Both Orders One Monday. When Will The Store Next Received Both Orders On The Same Day ?