We are given the following values:
0.125 pound
0.1 pound
0.12 pound
All values start with the same number which is 0.1, therefore the 0.1 is the smallest.
Next the two values are followed by 0.12, so 0.12 is the next smaller number.
So the largest number is 0.125.
Arranging from least to greatest amount of trail mix eaten:
Dana, Tracy, Joanna