20 beavers, working together in a constant pace, can build a dam in 18 hours. How many hours will it take 12 beavers that work at the same pace, to build the same dam?
Choose the correct choice from the following
A) 22.
B) 24.
C) 30.
D) 36
E) 38.
Total Work = 20*18= 
<gadget id="calculator">20*18</gadget>
<output>360</output>
360 Beaver hours   12 Beaver * x=360 Beaver hours   x=360/12= 
<gadget id="calculator">360/12</gadget>
<output>30</output>
30   ANSWER:30.
<result>C</result>
20 beavers, working together in a constant pace, can build a dam in 18 hours. How many hours will it take 12 beavers that work at the same pace, to build the same dam?