24 machines can do a work in 10days. How many machines are needed to complete the work in 40days?
Choose the correct choice
A) 10  B) 6  C) 4  D) 7  E) 5
Required number of machines = 24*10/40= 
<gadget id="calculator">24*10/40</gadget>
<output>6</output>
6   Answer is 6
<result>B</result>
24 machines can do a work in 10days. How many machines are needed to complete the work in 40days?