Determining the Atmospheric Pressure of Partial Pressures

What is the atmospheric pressure if the partial pressures of nitrogen, oxygen, and argon are 77.75 kPa, 19.94 kPa, and 1.99 kPa, respectively?

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...are the three gases that you are given: nitrogen, oxygen, and argon. With this question, you have to assume that all the other gases in the atmosphere contribute an insignificant amount to the atmospheric pressure.

So the ...