20 beavers, working together in a constant pace, can build a dam in 6 hours. How many hours will it take 12 beavers that work at the same pace, to build the same dam? Pick:
A) 10.
B) 4.
C) 5.
D) 6
E) 8.
Total Work = 20*6= 
<gadget id="calculator">20*6</gadget>
<output>120</output>
120 Beaver hours   12 Beaver * x=120 Beaver hours   x=120/12= 
<gadget id="calculator">120/12</gadget>
<output>10</output>
10   10.NSWER:10.
<result>A</result>
20 beavers, working together in a constant pace, can build a dam in 6 hours. How many hours will it take 12 beavers that work at the same pace, to build the same dam?