Divya and Vinayak are friends as well as cricket coaches in the same school. Divya goes to Excel school every 2 days while Vinayak goes there every 6 days to deliver coaching classes. If they both delivered the coaching sessions today, how many days, in the next 30 days, will both of them be delivering the coaching sessions on the same day?

209 cola cans and 253 fruit juice cans need to be stacked in a school canteen. If each stack is to be of the same height and has to contain cans of the same type, find the greatest number of cans each stack can have.

The dog starts from 7 m and jumps 2 m every time. The rabbit starts from 11 m and jumps 1 m every time. If they both start at the same time, after how many jumps will the dog catch the rabbit?