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anyanavicka [17]
3 years ago
15

Stoplight A changes color every 45 seconds and Stoplight B changes color every 80 seconds. Both stoplights changed color 60 seco

nds ago. After how many seconds will the stoplights change color at the same time again.​
Mathematics
1 answer:
LenaWriter [7]3 years ago
3 0

9514 1404 393

Answer:

  660 seconds

Step-by-step explanation:

The least common multiple of 45 seconds and 80 seconds is ...

  45×80/GCF(45,80) = 45×80/5 = 720

The next change will be 720 seconds after the last one, so 720 -60 = 660 seconds from now.

_____

<em>Additional comment</em>

You can find the least common multiple by looking at the factors of 45 and 80:

  • 45 = 5×9
  • 80 = 5×16

The LCM will include one copy of the common factor and all of the unique factors:

  LCM(45, 80) = 5×9×16 = 720

You can see that the greatest common factor is 5, and that the LCM is the product (5×9)(5×16) divided by 5:

  LCM(a, b) = a×b/GCF(a, b)

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