The expression ' a fixed number of tons'. is fine. It means that someone has decided eg 'Every time we produce shoes, we will produce 5 tons'.
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The expression 'a fixed number of tons'. is fine. It means that someone has decided eg 'Every time we produce shoes, we will produce 5 tons'.
It's not incorrect grammar, but the logic of the writer seems a little odd. If they produce a fixed number of tons, why do they then need to be weighed?