An advertisement board displays letters in green-coloured and pictures in yellow-coloured lights. The green light glows after every 10 seconds and the yellow light glows after every 15 seconds. If both the lights are turned on at the same time, after how many seconds will they glow together again.
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Answer:
30 seconds
Step-by-step explanation:
The idea here is to find the LCM.
The LCM for 15 and 10 is 30,hence 30.
10 : 10 , 20 , 30 , 40 , 50 , 60
15 : 15 , 30 , 45 , 60 , 75 , 90
The lights glow together after 30 seconds of switching it on. The lights glow together again after 60 seconds since turning on and so on.
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