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Barrett and John are really getting serious about Quick Fire Questions now, so be prepared for some tension between them. Helena Wart writes in with a question involving sofas, dogs, and a lot of numbers. John is confused, but luckily Barrett can put him straight with some simple mathematics. The Roleplay Problem this week comes in the form of Jerry, a little boy who wants to get computer games back on his computer. Barrett's field of expertise doesn't cover kids, so it'll be interesting to see how he handles this one!