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Last Month's Problem: "Under Pressure"

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The velocity, density, and pressure of a certain fluid are related by the equation 5v2 + P = c, where v is the velocity in meters per second, P is the pressure in pascals, and c is a constant. If the velocity of this fluid decreases from 10 meters per second to 5 meters per second, by how many pascals does the pressure in the fluid rise?

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