The amount of time it takes p people to paint d doors varies directly with the number of doors and inversely with the number of people. Four people can paint 10 doors in 2 hours. How many people will it take to paint 25 doors in 5 hours?

Let t = k·d/p, where t is time, d is doors, and p is people. From 2 hours for 10 doors with 4 people, k = 2·4/10 = 0.8. For 25 doors in 5 hours, 5 = 0.8·25/p, so p = 4. The correct choice is 4 people.

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