16 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
A) 10	B) 6	C) 4	D) 7	E) 5
Required number of machines = 16*10/40= 
<gadget id="calculator">16*10/40</gadget>
<output>4</output>
4   Answer is 4
<result>C</result>
16 machines can do a work in 10days. How many machines are needed to complete the work in 40days?