18 beavers, working together in a constant pace, can build a dam in 8 hours. How many hours will it take 36 beavers that work at the same pace, to build the same dam?
Choose the correct answer:
A) 2.  B) 4.  C) 5.  D) 6  E) 8.
Total Work = 18*8= 
<gadget id="calculator">18*8</gadget>
<output>144</output>
144 4.eaver hours   36 4.eaver * x=1444.eaver hours   x=144/36= 
<gadget id="calculator">144/36</gadget>
<output>4</output>
4   ANSWER:4.
<result>B</result>
18 beavers, working together in a constant pace, can build a dam in 8 hours. How many hours will it take 36 beavers that work at the same pace, to build the same dam?