So you t start with 60 because that is how many gallons Jim has. Then you can count by tens until you get to 100. it takes 10 tens to get to 100 which means that for each 10 mins 1 gallon is lost. so the number of gallons lost in 100 mins is 10. so the point would read (100, 50) for every hundred mins, 10 gallons of water are lost. nUntil you hit zero because cannot have negative amounts of water. Even s helps!
