Let x be the total number of nurses at the hospital.
The number of nurses working in labor and delivery is 40/100 * x = x/2.
Since we know that 20 nurses work in labor and delivery, we can set up the equation x/2 = 20.
Multiplying through by 2, we get x = 20 * 2 = <<20*2=40>>40.
Therefore, there are 40 nurses working at the hospital. Answer: \boxed{40}.
At a hospital, 40% of the nurses work in labor and delivery. if 20 nurses work in labor and delivery. how many nurses work at a hospital?
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