Q. 4 BELLS RANG TOGETHER AT 9.00 A.M. THEY TOLL AFTER 7,8,11,12 SECONDS RESPECTIVELY. HOW MANY TIMES WILL THEY TOLL TOGETHER AGAIN ON NEXT 3 HOURS?

• LCM of 7,8,11,12 is 1848 seconds
  so in 3 hour 3*3600/1848=5.84 time
  so 5 time answer
• 11 years agoHelpfull: Yes(4) No(1)
• lcm of 7,8,11,12 = 1848
  it means they will toll together after every 1848 secs
  3hrs=3600*3 secs=10800secs
  now, 10800/1848=5 times
• 11 years agoHelpfull: Yes(2) No(0)
• The LCM of (7,8,11,12) is 1848s
  in 3 hrs there are 10800 seconds
  Dividing 10800/1848 we get 5 (approx) so 5 times is the answer
• 11 years agoHelpfull: Yes(1) No(1)
• LCM : 7, 8,11,12 = 1848 seconds or 30.8 minutes
  for next 3 hours means 3 x 60=180
  answer should be less then 180
  so from options if we take 5 x 30.8=154 and 6 x 30.8=184.8
  so the answer is 5.
• 10 years agoHelpfull: Yes(1) No(0)
• LCM of 7,8,11,12 is 1848 seconds.
  Now 3 hours = 3*3600 seconds.
  Therefore, number of times the bell rang = 10800/1848 = 5.84 times = 6 times
• 9 years agoHelpfull: Yes(1) No(1)