Morning class, I hope you all had a nice weekend. Now, coats off and let's get ready to begin, because three more pop maths teasers await.
A gold star goes to Adam Deritter, 100% correct in week six with the answers "electric", "level" and "state". Another marvellous prize awaits the winner this week – so best hop to it.
Please send your answers (to all three equations) with the title "Pop maths: Week seven" to music.editor@guardianunlimited.co.uk and we'll pull one out of the inbox. Entry closes at midnight on Thursday 22 January.
Remember, the answers are all words from band names and not numbers. If you're not sure, check out the rules. Some questions may have multiple answers – but any correct one is OK by us.
