At a well known store they sell their own blend of coffee. They use:

Mocha | costing £13 per kilogram |

Kenyan | costing £14 per kilogram |

Brazilian | costing £17 per kilogram |

To make 11 kilograms of this blend of coffee costs £15 per kilogram.

This blend uses more Brazilian than Kenyan coffee.

An exact number of kilograms of each type of coffee is used.

How many kilograms of each type of coffee are used?