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?


n =  4


10:(10+n)=(154):15   15 10=(154) (10+n)  11n=40  n=40113.636364 =410:(10+n) = (15-4) : 15 \ \\ \ \\ \ \\ 15 \cdot \ 10 = (15-4) \cdot \ (10+n) \ \\ \ \\ 11n = 40 \ \\ \ \\ n = \dfrac{ 40 }{ 11 } \doteq 3.636364 \ \\ = 4

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