Correction here: I should be at 35 units and up, not 25-35. Miscalculated a bit. Oh well.
I read all of the answers as needing to be multiplied by 1.5!
It's like when you go to the doctors and they ask how many units of alcohol you drink in a week. You add it up in your head, think it sounds a bit high, worry that if you give the right answer you'll get a lecture especially as you know that nobody gives an honest answer, panic as you realise you're taking too long and then doctor is waiting, and then blurt out 6.