Answer :
never because even though they are only one digit away they add two days apart more each time so on the 15 it will be the 22 he is doing pilates and 17 he will do pilates on the 25 and on 19 he will do pilates on 28
so every 2 days sam jogs
every 3 days he does pilates
so
3 times 2 =6 so
on the 6th day he will do pilates and jog so
so on October 7 he does both pilates and jog
every 3 days he does pilates
so
3 times 2 =6 so
on the 6th day he will do pilates and jog so
so on October 7 he does both pilates and jog