Nathan can fill 10 FULL bags of mixed nuts.
To solve this problem, you must add up the total mass of ALL the nuts first.
3.64+ 2.79 = 6.43
3.44+2.73 = 6.17
6.43+ 6.17 = 12.60.
When Nathan mixes all of the nuts, it is 12.60 kg.
Since he is separating or dividing, you divide 12.60 by 1.2.
12.60 / 1.2 = 10.5
Since the question is asking FULL bags, the answer is 10.
Hope this helps! :)