Question

Two neon signs are turned on at the same time. Both signs blink as they are turned on.
One sign blinks every 9 seconds. The other sign blinks every 15 seconds. In how many
seconds will they blink together again?

Answer 1

Answer:

45 seconds

Step-by-step explanation:

Find the least common multiple (LCM) of 9 and 15.  To do that, first write the prime factorization of 9 and 15.

9 = 3²

15 = 3 × 5

The LCM must contain all the factors of each.

LCM = 3² × 5

LCM = 45

They blink together after 45 seconds.

Answer 2

Answer:45 seconds

Step-by-step explanation:

I just did it and got it right