P is able to do a piece of work in 15 days and Q can do the same work in 20 days. If
they can work together for 4 days, what is the fraction of work left?
A. 8/15
B.
7/15
C. 11/15
D.
2/11

• p=1/15 q=1/20
  (p+q) 1 days work=1/15 + 1/20=7/60
  (p+q) 4 days work=(7/60*4)=7/15
  remaning work=(1-7/15)=8/15
  option A
• 10 years agoHelpfull: Yes(22) No(0)
• Let the total work be LCM of 15,20 i.e. 60 units
  P's one day work=4 units
  Q's one day work=3 units
  They worked for 4 days
  P completed 16 units, Q did 12 units
  Remaining work=60-28=32 units.
  Fraction of remaining work=32/60=8/15
  Therefore A) is correct.
• 10 years agoHelpfull: Yes(1) No(0)
• p+q 1 day work=4/15+4/20
  =4/15+1/5
  let total work be 1
  so 4/15+1/5=7/15
  and 1-7/15=8/15
• 10 years agoHelpfull: Yes(0) No(0)
• Answer=8/15
  p=1/15 q=1/20
  (P+Q) 1 day work= (1/15+1/20)=7/60
  in 4 days=4*(7/60)=7/15
  work left=1-(7/15)=8/15
• 10 years agoHelpfull: Yes(0) No(0)
• Right Ans. is 8 /15
• 10 years agoHelpfull: Yes(0) No(0)
• P can complete in 15 days
  P 1day work is 1/15
  Q can complete in 20 days
  Q 1day work is 1/20
  P&Q are working together for 4 days
  [1/15 + 1/20]*4=7/15
  Work completed is 7/15
  Left work is 8/15
  Ans is 8/15
• 9 years agoHelpfull: Yes(0) No(0)
• p=1/15 and q=1/20
  p+q=1/15+1/20=7/60 one day work
  p+q for 4 days work=(7/60*4)=7/15
  remaining work=(1-7/15)=8/15
  option A
  
• 9 years agoHelpfull: Yes(0) No(0)
• 8/15
  p and Q together completed the work in 60/7 but in 1 day they completed the work in 7/60 and in 4 days
  it will be 7/15 and remaining=1-7/15=8/15
• 9 years agoHelpfull: Yes(0) No(0)
• total work = 60(lcm of 15,20)
  1 day work of p=4
  1 day work of q=3
  total work of p and q in 1 day is=7
  4 days they working together so it is 7*4=28
  60-28=32
  fraction of work left=32/60=8/15
• 9 years agoHelpfull: Yes(0) No(0)