In a manufacturing plant, it takes 36 machines 4 hours of continuous work to fill 8 standard orders. At this rate, how many hours of continuous work by 72 machines are required to fill 24 standard orders?	Choose the correct choice from the following answers
A) 3
B) 6
C) 8
D) 9
E) 12
the choices give away the answer..   36 machines take 4 hours to fill 8 standard orders..   in next eq we aredoubling the machines from 36 to 72, but thework is not doubling(only 1 1/2 times), = 4*48/72*24/8 = 6   Ans 6
<result>B</result>
In a manufacturing plant, it takes 36 machines 4 hours of continuous work to fill 8 standard orders. At this rate, how many hours of continuous work by 72 machines are required to fill 24 standard orders?