Family Maths Worded Problem

Wizarding money came in three denominations in the United Kingdom: bronze Knuts, silver Sickles and gold Galleons. There were 29 Knuts to a Sickle and 17 Sickles to a Galleon.

 

Rachel Baillie is going to buy a book for her first year at Hogwarts. She needs to buy a book called “Maths is Magic - Muggles Mathematics” By Jodie Hassett and Jade LoRicco. 

 

This book costs 3 Galleons and 2 Sickles. Rachel paid with all Knuts. How many Knuts did she need?