20 machines can do a work in 5days. How many machines are needed to complete the work in 10days?	Select:  A) 10  B) 15  C) 8  D) 12  E) 20
Required number of machines = 20*5/10= 
<gadget id="calculator">20*5/10</gadget>
<output>10</output>
10   10nswer is 10
<result>A</result>
20 machines can do a work in 5days. How many machines are needed to complete the work in 10days?