If you know the whole price for 2.4 gallons, divide the whole price by 2.4 to get the cost for one, because when you multiply the cost for 1 by 2.4, you get the total.
If you estimate 7 times 7=49 so the square root of 46 is less than 7 6 times 6= 36 so the square root of 46 is more than 6 so if you do it on a calculator the answer is 6.78
