Is it possible to use this construction? Is it correct?
He can provide as many pros as I can provide cons.
I can buy as many things as you can sell.
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Sign up to join this communityAs Kate Bunting said in her comment, the structures are fine and idiomatic.
You can also delete some material common to the two clauses and say, for instance: "He can provide as many pros as I can cons."
The two things compared should be broadly similar because of the inherent meaning of "as." You can say: "He speaks Greek as well as I speak Latin" to compare language ability; however, you would not say: "He speaks Greek as well as I can ski," except as a kind of joke. The abilities are not normally comparable by any common standard.