What is the ratio for 140 miles on 6 gallons?

Im assuming you want it to be how many miles per gallon but you didn't give much information.

you would start with 140miles per 6 gallons

to find how many miles per gallon you would divide both numbers by six and it would equal 23 1/3 miles per 1 gallon

All you need to do is to divide 140 with 6. Make sure you do it this way and not other because that is the order of numbers in the text of task. I assume this is for calculating consumption for some vehicle.

Anyway 140/6 = 23.333333

Which means that the ration is 23.3333 miles per gallon.