8 machines can do a work in 10days. How many machines are needed to complete the work in 40days? Choose the correct choice from the following answers:
A) 2
B) 6
C) 4
D) 7
E) 5
Required number of machines = 8*10/40= 
<gadget id="calculator">8*10/40</gadget>
<output>2</output>
2   2nswer is 2
<result>A</result>
8 machines can do a work in 10days. How many machines are needed to complete the work in 40days?