Mr. Alvarez spends $36 on diesel fuel each week. If the cost of diesel fuel is $3 per gallon, how many gallons of diesel fuel does Mr. Alvarez use in two weeks?
In a week, Mr. Alvarez uses $36/$3 = <<36/3=12>>12 gallons a week.
So in two weeks, he uses 12 x 2 = <<12*2=24>>24 gallons.
#### 24