Edmund's Brainteasers
Problem 14
Problem 14: The cake stall
It is the first Sunday in the month and Janet is selling three kinds of cakes at her stall. She has Fruit cakes at £3 each, Bakewell at £1.50 each, and Muffins at 50p each. She sells 20 cakes, some of each kind, and takes £20. How many of each kind of cake does she sell?