We know one thing, 5.9 miles is the amount per day.
Now, to solve a problem like this, we need to determine how many days in a month.
Well, usually, the majority amount of months have 30 days. So I will therefore use 30 days to solve.
5.9*30 = 177 miles
But wait....since it says 'about', it means that we must put this sign :- ≈
Final answer:- He runs about 177 miles a month.
