Answer: 16
Step-by-step explanation:
Given : Lin took 75 boxes of carrots and 80 boxes of potatoes to the market.
i.e. Total number of boxes of vegetables she took = 
Also, she sold 68 boxes of carrots and 71 boxes of potatoes.
i.e. Total number of boxes of vegetables she sold = 
Number of boxes of vegetable did she take home = 
Hence, the number of boxes of vegetable did she take home = 16