# 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?

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Looking for calculator of harmonic mean?

Looking for a statistical calculator?

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Do you have a linear equation or system of equations and looking for its solution? Or do you have quadratic equation?

Do you want to round the number?

Do you want to convert time units like minutes to seconds?

Most natural application of trigonometry and trigonometric functions is a calculation of the triangles. Common and less common calculations of different types of triangles offers our triangle calculator. Word trigonometry comes from Greek and literally means triangle calculation.

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