Question

Medication is prescribed in 6 out of every 10 hospital emergency room visits that involve an injury. If a large urban hospital had 930 emergency room visits involving an injury in the past​ month, how many of these visits would you expect included a prescription for​ medication?

Answer 1

We can first get the percentage of the emergency room visits that involves an injury. 
6 out of 10.
This will be (6/10)×100 = 60%

So, if there are 930 emergency room visits, the expected visits included a prescription for​ medication is;

60% of 930 = 60/100 × 930
                   = 0.6 ×930
                   = 558