Answer:
60% is the answer 60/100
Explanation:
30:50 is the ratio
60% is the percentage
as 60/100 is = 30:50
if it was 30% then the gallons held by her car would be 100
because it was 50 we just multiply the top to make a percentage equal to 30 x 2 = 60.
As 50 x 2 =100
= 60/100