A does a work in 20days and B does the same work in 5days. In how many days they together will do the same work? Choose the correct choice from the following options
A) 1  B) 2  C) 3  D) 4  E) 5
A+B can finish =AB/A+B = 20*5/(20+5)= 
<gadget id="calculator">20*5/(20+5)</gadget>
<output>4</output>
4days   Answer is 4
<result>D</result>
A does a work in 20days and B does the same work in 5days. In how many days they together will do the same work?