Remaining workload after 4 days: 300- 10*4=260 people * days.

The instructions from the superior require that it be completed 6 days in advance, that is, 24 days, and the remaining workload will be completed in 20 days.

Add x workers

10*26=( 10+X)*20

X=3 people

-the inverse relationship Y=K/X, that is, X*Y=K (where k is a fixed value).