b) On a multisport court, basketball is played every 2 days, indoor soccer
every 3 days and volleyball every 4 days. At the end of the days when the
practices of the three disciplines the court is maintained.
If the court was maintained on the first day of the month,
What were the dates of that month when the
maintenance?
What were the dates of that month when basketball was played and
volleyball on the same day?
Assuming that the month has 30 days, what days were there no
activity of the three disciplines?