Good morning class, oh how I missed you all yesterday. Don't tell anyone or they will think I've gone soft in the head
Firstly my deepest thanks to Miss Sheba for deputising yesterday, she did a fantastic job. It was so kind of her to take on the mantle when I was drunk ill yesterday.
Today's Question
It is reasonably simple, I'm saving the difficult one for tomorrow.
There are a couple of possibilities, it may involve BODMAS or brackets, or both. Do your worst. 
PS: Who has been in my bottom drawer? My gin water bottle has disappeared! ?