Question

I use 45 gallons of water per day. What is the average water use in Dec?

Answer 1

1240 because 31 days in December and you x 40 and get the answer

Answer 2

So you use 40 gallons of water *PER* day.
Average water use in Dec?
(hint: in math * means multiplication)
Dec. has 31 days 
so 
40 * 31
1240
Average water use is 1240 gallons

Hope this helps :)