Question

Emily sings every 3 weeks. Sam sings every 4 weeks. Ray sings every 10 weeks. What week do they all sing together?

Answer 1

E : 3,6,9,12,15........57,60

S : 4,8,12,16,20.......56,60

R : 10,20,30,40.......50,60

The 60th week

Answer 2

E : 3,6,9,12,15........57,60  (Went by 3)

S : 4,8,12,16,20.......56,60  (Went by 4)

R : 10,20,30,40.......50,60  (Went by 10)

The week that they all sang on was the 60th week