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I think that your question is incomplete but I will answer it anyway

In order to know how many pounds or lbs there will be in 7 crates we multiply 7 by 6.


Therefore, the heaviest possible weight in those 7 crates will be 42 pounds.

If only a bag can fit in a crate then we multiply 7 by 4 and get 28. 

You can ask me questions about this if it is still unclear