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If a crew of four people can paint the barn in three days, how long will it take a crew of two people?

A 6 days

Dividing 4 crewmembers by 2 crewmembers shows that 4 members are twice as many as 2 members. Multiply the number of days it would take 4 people to paint by 2 (3 × 2) to determine how long it would take 2 people to do the same task.