Go 0.35•22 and you get 7.7
9/10 of an ounce is 0.9. 0.9 X 72 = 64.8.
There is 64.8 ounces in a box.
5 and 3 = 8 liters , 5 and 4 = 9 liters, and 3 and 4 = 7 liters.
8 + 7 + 8 + 7 = 30 liters, so he can take the 5 liter bucket with the 3 liter bucket twice, and then use the 3 liter bucket and the 4 liter bucket twice.
