Ten cashiers

Ten cashiers are open at Tesco. Customers wait an average of 15 minutes. How many other cashiers have to open to reduce the waiting time by 4 minutes?

Correct answer:

n =  4

Step-by-step explanation:

10:(10+n)=(154):15  15 10=(154) (10+n)  11n=40  n=40113.636364=4



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