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?
Your answer:
Your answer:
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Looking for calculator of harmonic mean?
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Do you have a linear equation or system of equations and looking for its solution? Or do you have a quadratic equation?
Do you want to round the number?
Do you want to convert time units like minutes to seconds?
You need to know the following knowledge to solve this word math problem:
We encourage you to watch this tutorial video on this math problem: video1
