These are OK: We need another 20 workers / $20,000 for the project. We need an extra 20 workers / $20,000 for the project We need 20 extra workers / 20,000 extra dollars for the project We need a further 20 workers / $20,000 for the project We need an additional 20 workers / $20,000 for the project We need 20 additional workers / 20,000 additional dollars for the project. We need 20 more workers / 20,000 more dollars for the project We need 20 workers more / 20,000 dollars more for the project Only 'further' seems a little odd to me after the noun.
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