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Question
Six bells starts ringing logether and ring at intervals of 4, 8, 10, 12, 15 and 20 seconds respectively. How many times will they ring together in 60 minutes?
15
16
30
31
None of these
ANSWER : 4
Descrption
<p>LCM of 4, 8, 10, 12, 15 and 20 = 120 <br /> 120 seconds = 2 minutes <br /> Hence all the bells will ring together in every 2 minutes <br /> Hence, number of times they will ring together in 60 minutes = 1 + <math xmlns = "http://www.w3.org/1998/Math/MathML"><mfrac><mn>60</mn><mn>2</mn></mfrac><br /> </math> = 31</p>
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