Ben goes on holiday to Hong Kong. In Hong Kong, Ben sees a carnera costingliks3179.55
In London, an identical camera costs £285
The exchange rate is £1 = HK$12.30
Ben buys the camera in Hong Kong.
How much cheaper is the camera in Hong Kong than in London?

Frank has a devised a formula for his catering business that calculates the number of meatballs he needs to prepare. the formula is m=4a+2c, where c=number of children; m=number of meatballs; a=number of adults. how many meatballs are required for a party of 10 adults and 5 children?