9:21 is the original ratio but the simplest is 3:7
You could drive 1,320 miles on 60 gallons of gas
The range is the difference between the largest number and the smallest number. This means you subtract the smallest number from the largest number. If the range is 8, then you can add 8 to the smallest number on the list to get the largest number, m.
Our smallest number is 12, so add 8 to 12.
8 + 12 = 20, so m is 20.
I hope this helps!
I feel like your question is incomplete, but i’m pretty sure it’s $21