Each container is 50 pounds, forget about the second sentence it's just there to confuse you. One ton is 2,000 pounds, half of that is 1,000 lbs. 1,000 divided by 20 is 50. 50 pounds each.
The answer is the 3rd option
From least to greatest it would be: 1.2, 1.23, 2.31, 3.2 I believe hope that helped
