5 boys or 10 girls can complete a work in 20 days.find the time in which 8 boys and 9 girls can complete it

• ans=8 days
  5 boys' work=10 girls' work
  => 1 boys' work = 2 girls' work
  => 8 boys' and 9 girls' work = 8*2+9
  = 25 girls' work
  10 girls completes => 20 days
  1 girl will complete = 20*10=200 days
  25 girls will complete = 200/25 =8 days
  
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