Answer:
36.9 gallons were used in one month.
Explanation:
In order to find this out, we first take 3/5 and convert it into a decimal by dividing the numerator by the denominator
3 ÷ 5 = 0.6
Then, we can set up this equation to figure out how many gallons of gasoline were used:
0.6 x 61.5 = 36.9