Henry's bus can go just 12 miles on a gallon of gasoline. When he started his vacation, the gas tank of the bus was 5/6 full. Later, when Henry had driven 336 miles, the gauge showed that the tank was still 3/5 full. If his low on gas light will come on when he has 1/15 a tank remaining, how much farther can he go before seeing that light?

Answer 1

So on (5/6-3/5) tank, he can go 336 miles.
How much can he go for (3/5 - 1/15) of a tank?

Answer 2

I would set up a ratio

x/336 = (3/5 - 1/15)/(5/6 - 3/5)
x/336 = (8/15)/(7/30)
x/336 = 16/7
x = 336(16/7) = 768 miles