60 boys can complete a work in 40 days.how many men need to complete twice the work in 20 days  Choices:
A) 160  B) 170  C) 180  D) 190  E) 240
one man can complete the work in 40*60= 
<gadget id="calculator">40*60</gadget>
<output>2_400</output>
2400 days= one time work   to Complete the work twice it will be completed in   let M be the no. of worker assign for this therefore the eqn becomes   M*20=2*2400   M=240 workers   ANSW240R:240
<result>E</result>
60 boys can complete a work in 40 days.how many men need to complete twice the work in 20 days