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Challenge Problem of the Month

Answer correctly to win!

I will choose one person out of all the people who answer correctly to win a free Manhattan GRE Strategy Guide. If you're keen on calculations or on winning free things, you should try your hand this month.

See last month's answer

This Month's Problem: "Under Pressure"

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?

125
250
375
500
625
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