Question

Windows are cleaned at a house every 7 days.

Milk is delivered to the same house every 3 days.
On the 3rd June, the windows are cleaned and milk is delivered.
What is the next date when both happen on the same day?

Answer 1

Answer: 24th

7-14-21

3-6-9-12-15-18-21

plus the three extra days gets you the 24th