$40$ conservancy workers were employed for $10$ days to clean buildings affected by floods. The number of additional workers required to complete the work in $4$ days is

The total work is 40 workers multiplied by 10 days, which equals 400 worker-days. To complete this same 400 worker-days of work in 4 days, the required number of workers is 400 divided by 4, which equals 100 workers. The number of additional workers needed is 100 minus 40, which equals 60 additional workers.

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