John wants to lose weight.  He eats 1800 calories a day and burns 2300 a day.  If he needs to burn 4000 calories to lose 1 pound how many days will it take to lose 10 pounds?
He burns 2300-1800=<<2300-1800=500>>500 calories a day
He needs to burn 4000*10=<<4000*10=40000>>40,000 calories to hit his goal
That means it will take him 40,000/500=<<40000/500=80>>80 days
#### 80