From the question
We are to find
6000 lbs per day = how many tons per week
This implies
Per day = 6000 lbs
Hence, in one week we have
one week = 7 times 6000 lbs
one week = 42000lbs
Converting lbs to tons
recall
1 lbs = 0.0005 tons
Hence
42000 lbs = 42000 times 0.0005 ton
42000 lbs = 21 ton
Therefore,
6000 lbs per day = 21 tons per week