Two flash lights, of red and yellow colour respectively, flash at respective intervals of 9 seconds and 33 seconds.
24. In an interval of 250 seconds, what is the maximum possible difference in the number of times that the red and yellow lights flash?

• IF WE TAKE hcf of 9 and 33 then it cames 99
  so after 99 sec they will flash together.
  in 99 sec red flash 11 times and yellow flash 3 times.
  next 99 sec same will be repeat.
  and in remaining 52 sec red flash 5 times and yellow flash 1 time
  so total red flash is 27 and 7 times
  total difference is 20
• 9 years agoHelpfull: Yes(26) No(3)
• In the 243th second red light has its flash 27th time (250/9=27 approx)
  yellow has its flash 250/33=7 approx
  so 27-7=20
• 9 years agoHelpfull: Yes(7) No(0)
• ans=20
  27-7=20
• 9 years agoHelpfull: Yes(1) No(3)