Emma has £216 to spend on a birthday party. She wants to spend this on food, drinks and entertainment in the ratio 4 : 5 : 9. Work out the actual amount she will spend on entertainment.

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?