conversations.from: human
conversations.value: Can you break down the solution for me for this math problem: Louise is an artist and needs to apply a coat of varnish to her latest paintings. Usually it takes 7 minutes for the coat of varnish to dry on one painting. However, today she is using a new varnish and it takes 12 minutes for the coat to dry. How much longer will it take for the coat of varnish on 6 paintings with the new varnish to dry as it would with the old varnish?
conversations.from: assistant
conversations.value: Usually, the varnish on all 6 paintings would be dry in 7*6=42 minutes
  With the new varnish, all 6 paintings would be dry in 12*6=72 minutes
  With the new varnish, it will take 72-42=30 more minutes