Question

A student solve this problem and said the answer is 9 pounds.

Answer 1

Ethan bought 9.9 pounds of meat (2.2+3.6+4.1) I would say this is reasonable.

Answer 2

The student is wrong because if you do 
2(1/5) + 3(3/5) + 4(1/10) it all equals up to 2.6