20 beavers, working together in a constant pace, can build a dam in 3 hours. How many V hours will it take 12 beavers that work at the same pace, to build the same dam? Select the correct option:
A) 2 .
B) v = 4 .
C) v = 5 .
D) v = 6 .
E) 8 .

Rationale: "c . 5 hrs if there were 10 beavers it qould have taken double v = 6 hrs . . so closest to that option is 5 ."
Answer: C