Level 2
At a buffet promotion, for every 2 paying adults, the third adult gets to dine for free. Mr Chia dined with 13 friends at the restaurant. How many of them dined for free?
Level 2
During a promotion at a bird park, for every 4 visitors, the 5th visitor will be given a free admission ticket. How many free tickets will be given to a group of 46 visitors?