Question

Gasoline is about $2 per gallon. You use about gallons each day driving to and from work. How much should you budget for gasoline over the next month (about 20 workdays)?

Answer 1

You left off the number of gallons. I call it x
I assume x is for the round trip, although that is stated ambiguously.
then you use 20 x gallons/month
2 $/gallon * 20 x gallons/month = 40 x $/month

Answer 2

Thanks Damon, I have tried and tried that one but for some reason it just not look right.