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Answer to Q121
Two neon signs are turned on at the same time. One blinks every 12 seconds. The other blinks every 15 seconds. In how many seconds will they both blink at the same time?
The answer is simply the Lowest Common Multiples between the two number 12 and 15, which will be 2 x 2 x 3 x 5 = 60
Another way to prove this is that at 60 seconds, the 12 seconds sign would have blinked 60 ÷ 12 = 5 times while the 15 seconds sign would have blinked 60 ÷ 15 = 4 times.
Answer: 60 seconds
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