A compleats a work in 2.25 days ,b in 4.5,c in 9 and D in 18 days.they form group of two such yhat diff. is max. b/w them.
what is difference in the no of days they compleat that work??

• let a do in x day,then b do in 2x day, c in 4x day and d in 8x day(x=2.25)
  now 1/x+1/2x=3/2x, means 2x/3day-----(1)
  
  now second group... 1/4x+1/8x=3/8x, means 8x/3 days---(2)
  for diffrence 8x/3-2x/3=5x/3=5*2.25/3=4.5days
  ans. 4.5days
• 10 years agoHelpfull: Yes(39) No(1)
• C completes his work in 9 days.
  
  in 1 day he done 1/9th part of total work.
  
  in same way D completes 1/18th part of total work in a single day.
  
  now,they done (1/9+1/18)th part in 1 day.i.e, 1/6th part,i.e they will completes their total work in 6 days.
  
  same way A and B completes their total work in 1/(2.25+4.5)=1.5 days
  
  so the difference between two group is of 6-1.5=4.5 days.
• 10 years agoHelpfull: Yes(5) No(0)
• 2.25=9/4 days 9/2days=4.5days
  4/9+2/9=6/9
  1/9+1/18=3/18
  6-1.5=4.5 days
• 10 years agoHelpfull: Yes(4) No(0)
• 4.5 days is the ri8 answer
• 10 years agoHelpfull: Yes(3) No(0)
• 1/[(1/2.25)+(1/4.5)] - 1/[(1/9)+(1/18)]
  4.5*2.25/6.75 - 18/3
  1.5 - 6 = |-4.5| 4.5
• 10 years agoHelpfull: Yes(0) No(0)