This problem is from Advantage Testing's GMAT Math Test #5 section 1 question 13.
Company A sells rice by wight, while company B sells it by volume. Which company has the better price for a certain customer?
1) The price of rice at Company A is $0.70 per pound, while that at Company B is $5.00 per gallon.
2) The customer wants to buy 50 pounds of rice
The answer to the question is (E), but is it possible to answer this without knowing that there at 8 pounds in a gallon.